INT 41 P - MS Windows debugging kernel - "DefineDebugSegment"
	AX = 0050h
	BX = segment number in executable (0-based)
	CX = selector
	DX = instance handle
	SI = segment flags (0=code, 1=data)
	ES:DI -> module name of owner
Return: ???
SeeAlso: AX=0012h,AX=004Fh