>Application wrotes to screen using ? commands
>
>

SYS(602 , 1 )
>MODIFY WINDOW screen FONT 'Arial',14
>_Screen.Themes = .F.
>hide menu _msysmenu
>ACTIVATE SCREEN
>clear
>
>do while .t.
>clear
>  ?'1 Option1'
>  ?'2 Option 2'
>  ?'.  Exit'
>  
>  wait 'Select ' to valik
>clear
>...
>

>
>
>If running under RDP after switching to local desktop and back to RDP meu disappears. Whole screen is blank.
>
>How to fix this so that menu is visible after switching back to application ? I tried SYS(602 , 1 ) and SYS(602 , 0 ) but this
>does not fix blank screen.

If I'm not mistaken, one of the problems you're apt to run into with output using ? and ?? is that they don't participate in screen repaint requests.