INT 21 u - European MS-DOS 4.0 - "PRUN" - UNBLOCK A PROCESS
	AH = 9Ah
	DS:BX -> memory location processes may have blocked on
Return: AX = number of processes awakened
	ZF set if no processes awakened
Program: European MS-DOS 4.0 was written for Siemens in Germany and then used
	  by several other European OEMs; its release falls between mainstream
	  versions 3.2 and 3.3
Desc:	restart all processes waiting for the specified "restart" signal
SeeAlso: AH=99h,INT 2F/AX=0802h