Int 21 Fn F3  - Doubledos - Add Character To Keyboard Buffer Of Current J  [T]

   AH = F3h
   AL = character

Return: AL = 00h successful
        01h buffer full (128 characters)

See Also: AH=E3h"DoubleDOS",AH=F1h"DoubleDOS",AH=F2h"DoubleDOS"

See Also: AH=F8h"DoubleDOS"