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/usr/share/psychtoolbox-3/PsychBasic/IsWinVista.m is in psychtoolbox-3-common 3.0.14.20170103+git6-g605ff5c.dfsg1-1build1.

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function isVista = IsWinVista
% IsWinVista - Return if this is a MS-Windows Vista OS or later.
%

% History:
% 23.10.2012  mk  Written.

persistent isThisVista;
if isempty(isThisVista)
    if ~IsWin
        isThisVista = 0;
    else
        c = Screen('Computer');
        isThisVista = c.IsVistaClass;
    end
end

isVista = isThisVista;

return;