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<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"/><title>DrRacket: The Racket Programming Environment</title><link rel="stylesheet" type="text/css" href="../scribble.css" title="default"/><link rel="stylesheet" type="text/css" href="../manual-style.css" title="default"/><link rel="stylesheet" type="text/css" href="../manual-racket.css" title="default"/><link rel="stylesheet" type="text/css" href="../doc-site.css" title="default"/><script type="text/javascript" src="../scribble-common.js"></script><script type="text/javascript" src="../manual-racket.js"></script><script type="text/javascript" src="../doc-site.js"></script><script type="text/javascript" src="../local-redirect/local-redirect.js"></script><script type="text/javascript" src="../local-redirect/local-user-redirect.js"></script><!--[if IE 6]><style type="text/css">.SIEHidden { overflow: hidden; }</style><![endif]--></head><body id="doc-racket-lang-org"><div class="tocset"><div class="tocview"><div class="tocviewlist tocviewlisttopspace"><div class="tocviewtitle"><table cellspacing="0" cellpadding="0"><tr><td style="width: 1em;"><a href="javascript:void(0);" title="Expand/Collapse" class="tocviewtoggle" onclick="TocviewToggle(this,"tocview_0");">▼</a></td><td></td><td><a href="" class="tocviewselflink" data-pltdoc="x">Dr<span class="mywbr"> </span>Racket:<span class="mywbr"> </span> The Racket Programming Environment</a></td></tr></table></div><div class="tocviewsublistonly" style="display: block;" id="tocview_0"><table cellspacing="0" cellpadding="0"><tr><td align="right">1 </td><td><a href="interface-essentials.html" class="tocviewlink" data-pltdoc="x">Interface Essentials</a></td></tr><tr><td align="right">2 </td><td><a href="languages.html" class="tocviewlink" data-pltdoc="x">Languages</a></td></tr><tr><td align="right">3 </td><td><a href="Interface_Reference.html" class="tocviewlink" data-pltdoc="x">Interface Reference</a></td></tr><tr><td align="right">4 </td><td><a href="extending-drracket.html" class="tocviewlink" data-pltdoc="x">Extending Dr<span class="mywbr"> </span>Racket</a></td></tr><tr><td align="right"></td><td><a href="doc-index.html" class="tocviewlink" data-pltdoc="x">Index</a></td></tr></table></div></div></div><div class="tocsub"><div class="tocsubtitle">On this page:</div><table class="tocsublist" cellspacing="0"><tr><td><span class="tocsublinknumber"></span><a href="#%28part._top%29" class="tocsubseclink" data-pltdoc="x">Dr<span class="mywbr"> </span>Racket:<span class="mywbr"> </span> The Racket Programming Environment</a></td></tr></table></div></div><div class="maincolumn"><div class="main"><div class="versionbox"><span class="version">6.1</span></div><div class="navsettop"><span class="navleft"><form class="searchform"><input class="searchbox" style="color: #888;" type="text" value="...search manuals..." title="Enter a search string to search the manuals" onkeypress="return DoSearchKey(event, this, "6.1", "../");" onfocus="this.style.color="black"; this.style.textAlign="left"; if (this.value == "...search manuals...") this.value="";" onblur="if (this.value.match(/^ *$/)) { this.style.color="#888"; this.style.textAlign="center"; this.value="...search manuals..."; }"/></form> <a href="../index.html" title="up to the documentation top" data-pltdoc="x" onclick="return GotoPLTRoot("6.1");">top</a></span><span class="navright"> <span class="nonavigation">← prev</span> <a href="../index.html" title="up to the documentation top" data-pltdoc="x" onclick="return GotoPLTRoot("6.1");">up</a> <a href="interface-essentials.html" title="forward to "1 Interface Essentials"" data-pltdoc="x">next →</a></span> </div><h2 x-source-module="(lib "scribblings/drracket/drracket.scrbl")" x-part-tag=""top""><a name="(part._top)"></a><a name="(part._.Dr.Racket__.The_.Racket_.Programming_.Environment)"></a>DrRacket: The Racket Programming Environment</h2><div class="SAuthorListBox"><span class="SAuthorList"><p class="author">Robert Bruce Findler<br/>and PLT</p></span></div><p>DrRacket is a graphical environment for developing programs using the
Racket programming languages.</p><table cellspacing="0" cellpadding="0"><tr><td><p><span class="hspace"> </span><a href="interface-essentials.html" class="toptoclink" data-pltdoc="x">1<span class="hspace"> </span>Interface Essentials</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="buttons.html" class="toclink" data-pltdoc="x">1.1<span class="hspace"> </span>Buttons</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="choose-language.html" class="toclink" data-pltdoc="x">1.2<span class="hspace"> </span>Choosing a Language</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="editor.html" class="toclink" data-pltdoc="x">1.3<span class="hspace"> </span>Editing with Parentheses</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="Searching.html" class="toclink" data-pltdoc="x">1.4<span class="hspace"> </span>Searching</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="Tabbed_Editing.html" class="toclink" data-pltdoc="x">1.5<span class="hspace"> </span>Tabbed Editing</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="interactions-window.html" class="toclink" data-pltdoc="x">1.6<span class="hspace"> </span>The Interactions Window</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="interactions-window.html#%28part._.Errors%29" class="toclink" data-pltdoc="x">1.6.1<span class="hspace"> </span>Errors</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="interactions-window.html#%28part._.Input_and_.Output%29" class="toclink" data-pltdoc="x">1.6.2<span class="hspace"> </span>Input and Output</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="Graphical_Syntax.html" class="toclink" data-pltdoc="x">1.7<span class="hspace"> </span>Graphical Syntax</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="Graphical_Syntax.html#%28part._images%29" class="toclink" data-pltdoc="x">1.7.1<span class="hspace"> </span>Images</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="Graphical_Syntax.html#%28part._xml-boxes%29" class="toclink" data-pltdoc="x">1.7.2<span class="hspace"> </span>XML Boxes and Racket Boxes</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="debugger.html" class="toclink" data-pltdoc="x">1.8<span class="hspace"> </span>Graphical Debugging Interface</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="debugger.html#%28part._.Debugger_.Buttons%29" class="toclink" data-pltdoc="x">1.8.1<span class="hspace"> </span>Debugger Buttons</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="debugger.html#%28part._.Definitions_.Window_.Actions%29" class="toclink" data-pltdoc="x">1.8.2<span class="hspace"> </span>Definitions Window Actions</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="debugger.html#%28part._.Stack_.View_.Pane%29" class="toclink" data-pltdoc="x">1.8.3<span class="hspace"> </span>Stack View Pane</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="debugger.html#%28part._.Debugging_.Multiple_.Files%29" class="toclink" data-pltdoc="x">1.8.4<span class="hspace"> </span>Debugging Multiple Files</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="module-browser.html" class="toclink" data-pltdoc="x">1.9<span class="hspace"> </span>The Module Browser</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="color-scheme.html" class="toclink" data-pltdoc="x">1.10<span class="hspace"> </span>Color Schemes</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="create-exe.html" class="toclink" data-pltdoc="x">1.11<span class="hspace"> </span>Creating Executables</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="follow-log.html" class="toclink" data-pltdoc="x">1.12<span class="hspace"> </span>Following Log Messages</a></p></td></tr><tr><td><p><span class="hspace"></span></p></td></tr><tr><td><p><span class="hspace"> </span><a href="languages.html" class="toptoclink" data-pltdoc="x">2<span class="hspace"> </span>Languages</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="module.html" class="toclink" data-pltdoc="x">2.1<span class="hspace"> </span>Language Declared in Source</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="legacy.html" class="toclink" data-pltdoc="x">2.2<span class="hspace"> </span>Legacy Languages</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="htdp-langs.html" class="toclink" data-pltdoc="x">2.3<span class="hspace"> </span><span style="font-style: italic">How to Design Programs</span> Teaching Languages</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="experimental-langs.html" class="toclink" data-pltdoc="x">2.4<span class="hspace"> </span>Other Experimental Languages</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="output-syntax.html" class="toclink" data-pltdoc="x">2.5<span class="hspace"> </span>Output Printing Styles</a></p></td></tr><tr><td><p><span class="hspace"></span></p></td></tr><tr><td><p><span class="hspace"> </span><a href="Interface_Reference.html" class="toptoclink" data-pltdoc="x">3<span class="hspace"> </span>Interface Reference</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="Menus.html" class="toclink" data-pltdoc="x">3.1<span class="hspace"> </span>Menus</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="Menus.html#%28part._menu~3afile%29" class="toclink" data-pltdoc="x">3.1.1<span class="hspace"> </span><span class="ssansserif">File</span></a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="Menus.html#%28part._.Edit%29" class="toclink" data-pltdoc="x">3.1.2<span class="hspace"> </span><span class="ssansserif">Edit</span></a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="Menus.html#%28part._menu~3aview%29" class="toclink" data-pltdoc="x">3.1.3<span class="hspace"> </span><span class="ssansserif">View</span></a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="Menus.html#%28part._.Language%29" class="toclink" data-pltdoc="x">3.1.4<span class="hspace"> </span><span class="ssansserif">Language</span></a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="Menus.html#%28part._menu~3aracket%29" class="toclink" data-pltdoc="x">3.1.5<span class="hspace"> </span><span class="ssansserif">Racket</span></a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="Menus.html#%28part._.Insert%29" class="toclink" data-pltdoc="x">3.1.6<span class="hspace"> </span><span class="ssansserif">Insert</span></a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="Menus.html#%28part._.Windows%29" class="toclink" data-pltdoc="x">3.1.7<span class="hspace"> </span><span class="ssansserif">Windows</span></a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="Menus.html#%28part._.Help%29" class="toclink" data-pltdoc="x">3.1.8<span class="hspace"> </span><span class="ssansserif">Help</span></a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="prefs-explanation.html" class="toclink" data-pltdoc="x">3.2<span class="hspace"> </span>Preferences</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="prefs-explanation.html#%28part._.Font%29" class="toclink" data-pltdoc="x">3.2.1<span class="hspace"> </span><span class="ssansserif">Font</span></a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="prefs-explanation.html#%28part._.Colors%29" class="toclink" data-pltdoc="x">3.2.2<span class="hspace"> </span><span class="ssansserif">Colors</span></a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="prefs-explanation.html#%28part._.Editing%29" class="toclink" data-pltdoc="x">3.2.3<span class="hspace"> </span><span class="ssansserif">Editing</span></a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="prefs-explanation.html#%28part._.Warnings%29" class="toclink" data-pltdoc="x">3.2.4<span class="hspace"> </span><span class="ssansserif">Warnings</span></a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="prefs-explanation.html#%28part._.General%29" class="toclink" data-pltdoc="x">3.2.5<span class="hspace"> </span><span class="ssansserif">General</span></a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="prefs-explanation.html#%28part._.Profiling%29" class="toclink" data-pltdoc="x">3.2.6<span class="hspace"> </span><span class="ssansserif">Profiling</span></a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="prefs-explanation.html#%28part._.Browser%29" class="toclink" data-pltdoc="x">3.2.7<span class="hspace"> </span><span class="ssansserif">Browser</span></a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="prefs-explanation.html#%28part._.Tools%29" class="toclink" data-pltdoc="x">3.2.8<span class="hspace"> </span><span class="ssansserif">Tools</span></a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="Keyboard_Shortcuts.html" class="toclink" data-pltdoc="x">3.3<span class="hspace"> </span>Keyboard Shortcuts</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="Keyboard_Shortcuts.html#%28part._.Moving_.Around%29" class="toclink" data-pltdoc="x">3.3.1<span class="hspace"> </span>Moving Around</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="Keyboard_Shortcuts.html#%28part._.Editing_.Operations%29" class="toclink" data-pltdoc="x">3.3.2<span class="hspace"> </span>Editing Operations</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="Keyboard_Shortcuts.html#%28part._.File_.Operations%29" class="toclink" data-pltdoc="x">3.3.3<span class="hspace"> </span>File Operations</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="Keyboard_Shortcuts.html#%28part._.Search%29" class="toclink" data-pltdoc="x">3.3.4<span class="hspace"> </span>Search</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="Keyboard_Shortcuts.html#%28part._.Evaluation%29" class="toclink" data-pltdoc="x">3.3.5<span class="hspace"> </span>Evaluation</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="Keyboard_Shortcuts.html#%28part._.Documentation%29" class="toclink" data-pltdoc="x">3.3.6<span class="hspace"> </span>Documentation</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="Keyboard_Shortcuts.html#%28part._.Interactions%29" class="toclink" data-pltdoc="x">3.3.7<span class="hspace"> </span>Interactions</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="Keyboard_Shortcuts.html#%28part._.La.Te.X_and_.Te.X_inspired_keybindings%29" class="toclink" data-pltdoc="x">3.3.8<span class="hspace"> </span>LaTeX and TeX inspired keybindings</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="Keyboard_Shortcuts.html#%28part._defining-shortcuts%29" class="toclink" data-pltdoc="x">3.3.9<span class="hspace"> </span>Defining Custom Shortcuts</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="Keyboard_Shortcuts.html#%28part._.Sending_.Program_.Fragments_to_the_.R.E.P.L%29" class="toclink" data-pltdoc="x">3.3.10<span class="hspace"> </span>Sending Program Fragments to the REPL</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="drracket-files.html" class="toclink" data-pltdoc="x">3.4<span class="hspace"> </span>DrRacket Files</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="drracket-files.html#%28part._drracket-file-formats%29" class="toclink" data-pltdoc="x">3.4.1<span class="hspace"> </span>Program Files</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="drracket-files.html#%28part._drracket-autosave-files%29" class="toclink" data-pltdoc="x">3.4.2<span class="hspace"> </span>Backup and Autosave Files</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="drracket-files.html#%28part._.Preference_.Files%29" class="toclink" data-pltdoc="x">3.4.3<span class="hspace"> </span>Preference Files</a></p></td></tr><tr><td><p><span class="hspace"></span></p></td></tr><tr><td><p><span class="hspace"> </span><a href="extending-drracket.html" class="toptoclink" data-pltdoc="x">4<span class="hspace"> </span>Extending DrRacket</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="extending-drracket.html#%28part._teachpacks%29" class="toclink" data-pltdoc="x">4.1<span class="hspace"> </span>Teachpacks</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="extending-drracket.html#%28part._.Adding_.Your_.Own_.Teachpacks_to_the_.Teachpack_.Dialog%29" class="toclink" data-pltdoc="x">4.1.1<span class="hspace"> </span>Adding Your Own Teachpacks to the Teachpack Dialog</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="extending-drracket.html#%28part._environment-variables%29" class="toclink" data-pltdoc="x">4.2<span class="hspace"> </span>Environment Variables</a></p></td></tr><tr><td><p><span class="hspace"></span></p></td></tr><tr><td><p><span class="hspace"> </span><a href="doc-index.html" class="toptoclink" data-pltdoc="x">Index</a></p></td></tr></table><div class="navsetbottom"><span class="navleft"><form class="searchform"><input class="searchbox" style="color: #888;" type="text" value="...search manuals..." title="Enter a search string to search the manuals" onkeypress="return DoSearchKey(event, this, "6.1", "../");" onfocus="this.style.color="black"; this.style.textAlign="left"; if (this.value == "...search manuals...") this.value="";" onblur="if (this.value.match(/^ *$/)) { this.style.color="#888"; this.style.textAlign="center"; this.value="...search manuals..."; }"/></form> <a href="../index.html" title="up to the documentation top" data-pltdoc="x" onclick="return GotoPLTRoot("6.1");">top</a></span><span class="navright"> <span class="nonavigation">← prev</span> <a href="../index.html" title="up to the documentation top" 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