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Application use this when it is convenient to toggle between reading keyboard a short while and do other house keeping tasks.
Bugs
Crashes OZ while in a popdown with safe workspace more than 32 bytes, and the popdown gets pre-empted (RC_QUIT).
Related calls
GN_Sip, system input line routine
OS_In, read (wait for) character from standard input
OS_Pur, purge keyboard buffer
OS_Xin, examine input