If it’s not used in Germany, you get the error message saying e.g.:
“Send Vier Gewinnt Invitation
Vier Gewinnt: This Plugin is not supported by the other side”
You can see on the screenshot that really all Xtraz are listd under “Hot on ICQ”
Great, no? 🙂
So no need to use the branded ICQ5.1’s anymore! For none of the Germans, at least!