25.1. Limitations
Note that as soon as more than one user play a role in such a context, the semantics of IsOnScreen changes to at least one user can see it on screen.
In order to monitor who actually sees the context, we’d have to modify the mechanism to change a property on a user role. MyContexts must then be adapted to try to modify that property for the current user opening the screen (Note: this will not work for calculated user roles!).