(spawn-command path ?arg-list ?env-list) -> stream
Creates a read/write channel to a process run in the host environment.
Example:
>> (define x (spawn-command "/bin/cat")) :: [stream 80DF9A8] >> (send "Alpha" x) :: null > (wait x) :: "Alpha" >> (send "Beta" x) :: null >> (wait x) :: "Beta"
IMPORTANT: spawn-command may not be used with Win32 systems.