Force a window repaint?

Is there a way to force a window repaint?

I'm calling a function that can take awhile to return when complete. I'd like to have some sort of display that it is running, but it seems I need to repaint the window to see the effects of an updated control. Is this possible in BlitzPlus?

-Byrt

You can call a API function : redrawWindow

Add it in a userlib declaration.