Hide a program from the Windows task bar

You can set the visible property of a window to false

w_window.visble = false

but the window is not visible anymore.

To keep the window visible but not in the task bar, define the external function

FUNCTION ulong SetWindowLongA( ulong hWnd, int nIndex, long newValue ) &
LIBRARY "USER32.DLL"

and then in the window open event

long ll_rc

ll_rc = SetWindowLongA(Handle(This), -20, 128)
IF ll_rc = 0 THEN
   // something wrong on the kingdom!
END IF