INT 21 - Attachmate Extra! - SET HOST WINDOW STATE                              
	AH = A2h
	AL = new host window status byte (see #01798)
SeeAlso: AH=A1h


Bitfields for Attachmate Extra! host window status:
Bit(s)	Description	(Table 01798)
 7	0=power off, 1=power on
 6	0=not installed, 1=installed
 5-3	reserved
 2-0	window number 1-4=host B-E