Int 2F Fn 1606  - Ms Windows - Windows Enhanced Mode & 286 Dosx Exit Broa  [W]

   AX = 1606h
   DX = flags
       bit 0 = 0 if Windows enhanced-mode exit
       bit 0 = 1 if Microsoft 286 DOS extender exit
       bits 1-15 reserved (undefined)

Notes: if the init broadcast fails (AX=1605h returned CX <> 0), then this
     broadcast will be issued immediately.
   this call will be issued in real mode
   Novell DOS v7.0 (Update 8 - Update 15) TASKMGR in multitasking mode
     uses this broadcast, even if TASKMGR.INI sets WinPresent= to OFF

See Also: AX=1605h,AX=1609h