Int 2F Fn 1A00  - Avatar.sys - Installation Check                          [V]

   AX = 1A00h
   BX = 4156h ('AV')
   CX = 4154h ('AT')
   DX = 4152h ('AR')

Return: AL = FFh if installed
       CF clear
       BX = AVATAR protocol level supported
       CX = driver type
       0000h AVATAR.SYS
       4456h DVAVATAR.COM inside DESQview window
       DX = 0016h
Program: AVATAR.SYS is a CON replacement by George Adam Stanislav which
     interprets AVATAR command codes in the same way that ANSI interprets
     ANSI command codes

Notes: AVATAR also identifies itself as ANSI.SYS if BX, CX, or DX differ from
     the magic values