Int 15 Fn 85  C - Os Hook - Sysreq Key Activity (at,ps)                    [B]

   AH = 85h
   AL = SysReq key action (00h pressed, 01h released)
   CF clear

Return: CF clear if successful
       AH = 00h
   CF set on error
       AH = status (see #0422)

Notes: called by keyboard decode routine
   the default handler simply returns successfully; programs which wish
     to monitor the SysReq key must hook this call
   the SysReq key is often labeled SysRq

See Also: INT 09