Int 2F Fn 1A02  U - DOS 4+ Ansi.sys Internal - Miscellaneous Requests      [V]

   AX = 1A02h
   DS:DX -> parameter block (see below)

Note:  DOS 5+ chains to previous handler if AL > 02h on call

See Also: AX=1A01h

Format of parameter block:
Offset Size    Description
 00h   BYTE    subfunction
       00h set/reset interlock
       01h get /L flag
 01h   BYTE    interlock state
       00h=reset, 01h=set
         This interlock prevents some of the ANSI.SYS post-processing
         in its hook onto INT 10, AH=00h mode set
 02h   BYTE    (returned)
       00h if /L not in effect
       01h if /L in effect