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/usr/lib/s9fes/help/set-input-portb is in scheme9 2010.11.13-2.

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S9fES  (set-input-port! input-port)    ==>  unspecific
       (set-output-port! output-port)  ==>  unspecific

Change the default input and output ports by mutating the values
returned by CURRENT-INPUT-PORT and CURRENT-OUTPUT-PORT respectively.