/usr/lib/help/set-input-portb is in scheme9 2013.11.26-1.
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1 2 3 4 5 | 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.
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