Programmer 7500/MAX_PROGRAMMERS.iso/PASCAL/TOOL_INC.ZIP/INVIS.INC

Text File | 1988-01-29 | 471 b | 18 lines

(*
 * this function can be called to determine if "SLOW" mode displays are
 * required.  it should be called before each window OPEN/CLOSE action.
 *
 * it is SAFE to call and always returns FALSE when doubledos is not used.
 *
 *)
function invisible: boolean;   {is this the invisible program under doubledos?}
var
   reg:  registers;
begin
   reg.ax := $e400;   {doubledos return program status}
   msdos(reg);
   invisible := (lo(reg.ax) = 2);
end;