Int 1A Fn FF00  - Snd - Installation Check???                              [s]

   AX = FF00h

Return: AL = version??? (02h)
   AH = busy flag (00h if not in a SND call, 01h if SND currently active)

Note:  the SND API is also supported by IC (Internal Commands) v2.0, a
     shareware TSR by Geoff Friesen which extends COMMAND.COM's internal
     command set

See Also: AX=FF01h,AX=FF02h,AX=FF04h,AX=FF05h