INT 15 - DESQview v2.50+ - SEND MESSAGE 01h WITH ERROR RECOVERY                 
	AH = 12h
	BH = 81h
Note:	this function is identical to AH=12h/BH=01h, except that DESQview will
	  not pop up a "Programming Error" window, instead returning an error
	  code in AL (see #00455)
SeeAlso: AH=12h/BH=01h