Int 2F Fn 168B  - Ms Windows 3.1 - Set Focus To Specified Virtual Machine  [W]

   AX = 168Bh
   BX = virtual machine ID (see AX=1683h), 0000h for current DOS box

Return: AL = 00h if focus set to specified VM

Notes: documented on the Microsoft Developer's Network CD-ROM
   if the VM is a windowed DOS box, it will be set to full screen

See Also: AX=1683h