INT 21,50 - Set Current Process ID (Undocumented DOS 2.x)

AH = 50h

BX = process ID number (process ~PSP~ segment address)

returns nothing

- the process ID number is actually the segment address of a

program's PSP. This is useful for TSR's to access their own

file handle table inside their PSP.

- this function cannot be called while in an ~INT 28~ handler in

DOS 2.x unless the critical error flag is set or stack corruption

will occur

- safe in DOS 3.x INT 28 handlers since they use a different stack

by default

- available in OS/2 compatibility box

- see ~INT 21,51~ ~INT 21,62~