Int 62 Fn 00D3  u - Fgdriver V4.02 - "fg_vbhandle" - Get Active Virtual B  [V]

   AX = 00D3h

Return: AX = handle for active virtual buffer

Note:  the FGDRIVER functions are rearranged with each major release, but
     their parameters do not change (see #3145)

See Also: AX=00CCh,AX=00D4h