INT 67 - Q87 v4+ - INSTALLATION CHECK                                           
	AX = 4321h
	EAX = 87654321h (entire EAX value required)
Return: EAX = 12345678h if Q87 is installed
Note:	this call requires that VCPIsee Virtual Control Program Interface services be available; if they are not,
	  this call will not be recognized
BUG:	v4.00-v4.03 will hang on most machines when run under bare DOS with
	  no memory manager, because neither Q87 nor UNLOAD87 checks whether
	  there is a valid INT 67 handler before performing an installation
	  check via INT 67
SeeAlso: AX=2833h,INT 21/AX=4321h