Extending XFixes Extension

[Amir Bukhari]

The current Xserver does not give client the ability to query the server to
ask it which window belongs to (to client). A good example is: a Window
Manager can build a list of all window which belong to a client and so it
can manipulate its appearance as it wants and each client could have its
look and feel differently from others clients. 
This may be needed with 3D desktop like ours (Looking Glass 3D).

What did you think about this feature to add it to Xfixes?
Amir Bukhari
E-Mail: ufz6 at rz.uni-karlsruhe.de