Hi Manish,
I mean how is namespace resolved in l4.
L4 itself defines no namespace policies. However, to get a feeling how it could be done, have a lock at the slides of our practical seminar on microkernel-based system construction. You will find it at the web at http://os.inf.tu-dresden.de/Studium/Praktikum/. Although the side is in German, the slides are in English. Head for the "Name and Console Server" section.
Btw, what are you doing with L4?
Regards, Jork