| Command group | Flag affected | Reversible | Execute on client | Platform(s) |
| Windows | YES | NO | NO | All |
This command tests if the specified window instance is open. If the window instance is open, Omnis sets the flag, otherwise the flag is cleared. Window instances are opened with Open window instance or the $open() method.
# Open the window wMyWindow if it is not already openTest for window openwMyWindow
If flag falseOpen window instancewMyWindow
End If