INT 15 - TopView - "ISOBJ" - VERIFY OBJECT HANDLE

	AX = 1016h
	ES:DI = possible object handle
Return: BX = status
	    FFFFh if ES:DI is a valid object handle (see #00414)
	    0000h if ES:DI is not
Note:	under DESQview versions prior to 2.50, an object handle is always a
	  pointer to the object; for versions 2.50 and up, only task handles
	  are always pointers--other handles may consist of a unique object
	  number and offset into DESQview's common memory (see #00423)
SeeAlso: AX=DE14h,AX=DE2Bh,AX=DE2Ch