INT 62 - FGDRIVER v4.02 - "FG_VBUNDEF" - RELEASE HANDLE FOR VIRTUAL BUFFER AX = 00D9h BX = virtual buffer handle Notes: the FGDRIVER functions are rearranged with each major release, but their parameters do not change (see #03474) the specified handle must not reference the currently-active virtual buffer SeeAlso: AX=00D1h,AX=00D5h