INT 60 u - HP 95LX System Manager - "M_LOCK" - PREVENT TASK SWITCHES
	DI = 0602h
	STACK:	2 WORDs unused dummies (for calls from high level languages)
Return: ???
	STACK unchanged
SeeAlso: INT 15/AX=101Bh,INT 2F/AX=1681h,INT 60/DI=0603h