set-current-error-port[procedure] set-current-input-port port
[procedure] set-current-output-port port
[procedure] set-current-error-port port
Guile: sets current ports.
Scsh has set-current-input-port!, set-current-output-port! and set-error-output-port!.
ChezScheme and Chicken's current-input-port,
current-output-port and current-error-port
have the ability to change the current ports.
Other implementation provides with-input-from-port etc.,
to alternate current ports temporary.
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