Check solutions that come with VFP9. It's under "New in VFP8" from Task Pane Solutions or directly

DO form (HOME(2) + "Solution\toledo\systray_sample.scx")

>What I should make so that an application (when it is running a long process) is not shown in the user's screen; but rather an icon is shown in the taskbar and when it concludes it is shown the application again in the screen?