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/usr/lib/help/sys_fork is in scheme9 2013.11.26-1.

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S9 EXT  (sys:fork)  ==>  integer

Create a copy of the calling process, return the process ID of the
calling process (the parent process) to the parent process and zero
to the new process (the child process).

(sys:fork)  ==>  0  ; now there are two S9 interpreters running