应用程序在任务栏上可见？

我没有尝试：

{Wnd = your app. handle} if IsWindowVisible(Wnd) and ( (GetWindowLong(Wnd, GWL_HWNDPARENT) = 0) or (HWND(GetWindowLong(Wnd, GWL_HWNDPARENT)) = GetDesktopWindow) ) and ((GetWindowLong(Wnd, GWL_EXSTYLE) and WS_EX_TOOLWINDOW) = 0) then // your application is visible on taskbar 

你玩过吗？

 Application.MainFormOnTaskbar := False; 

和

 Application.MainForm.Visible := False; Application.ShowMainForm := False;