INT 60 u - HP 95LX System Manager - "M_UNLOCK" - ALLOW TASK SWITCHES
	DI = 0603h
	STACK:	2 WORDs unused dummies (for calls from high level languages)
Return: ???
	STACK unchanged
SeeAlso: INT 15/AX=101Ch,INT 2F/AX=1682h,INT 60/DI=0602h