>When I launch application with top-level form, I get two items on Windows taskbar (_SCREEN and TOPFORM). Is any way to suppress one of them?

Ed,

The following will take care of the _SCREEN:

SET LIBRARY TO FOXTOOLS
lnhWnd = MainHwnd()
DECLARE INTEGER ShowWindow IN Win32API;
  INTEGER hWnd, INTEGER uShow
= ShowWindow(lnhWnd, 0)

This'll make the _SCREEN an invisible window and it won't show on the task bar.