ftp.nice.ch/pub/next/unix/network/system/NeXTICS.NIHS.bs.tar.gz#/NeXTICS/Source/spawn.h

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extern int Spawn();
extern int childPID();
extern int WriteChars();
extern void RunSelect();
extern int childsOutput();
extern void cleanUp();
extern void turnOnEcho();
extern void turnOffEcho();

These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.