>I have an icon in the system tray which I can use to control my app, but how do I remove the app from being displayed in the taskbar. I know in VB there is the property ShowInTaskbar, what is it in VFP?

Form.Visible = .F. will remove the taskbar presense; you'll need to change this when you activate the app from the systray. The WindowState affects the ShowWindow mode of a visible form or Window context; VFP directly supports 3 - 0 is normal, 1 is minimized, and 2 maximized

If you run your app in the context of the main VFP screen, _SCREEN.Visible is the controlling object property for all forms in that context. If you use a top-level form, it has a taskbar presense independent of the main VFP window, so it falls back on the top-level form's visible property.