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Category: DOS kernel

INT 21 - European MS-DOS 4.0 - "FREEZE" - STOP A PROCESS

	AH = 81h
	BX = flag (00h freeze command subtree, 01h only specified process)
	CX = Process ID of head of command subtree
Return: CF clear if successful
	CF set on error
	    AX = error code (no such process)
Desc:	temporarily suspend a process or a process and all of its children
Note:	if BX=0001h, this call will not return until the process is actually
	  frozen, which may not be until after it unblocks from an I/O
SeeAlso: AH=82h,AH=89h,AX=8E00h,INT 15/AX=101Dh

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