Int 2F Fn BE00  - Redview - Installation Check                             [U]

   AX = BE00h

Return: AL = FFh if installed
Program: REDVIEW is a public-domain TSR by Alexandr Novy and Petr Horak which
     copies data sent to standard output to standard error when the
     former has been redirected to a file, thus allowing the data to
     be seen on the screen at the same time it is captured in a file