INT 21 U - CUBIT v4.00 - UNINSTALL                                              
	AX = 69FFh
	DX = CFBFh
	CX = EFCFh
	BX = CB00h (magic value)
Return: ES:BX -> CUBITR.EXE handler for INT 21
	CX = status
	    2020h successful
	    2222h failed
Note:	if DX is neither 0000h nor CFBFh on entry, some other code is executed
SeeAlso: AX=69FFh/DX=0000h