How client knows its callback is removed from the server

[Gops]

I have a client which talk to a remote dcom server.i registered a
callback in the server from client which gets called whenever an event
is occured in server.This works fine. but when the remote connection
fails, I think the server removes the client registration.but how the
client knows it's callback is removed? If the server comes within 1
minute,without any occurance of events in server, the registration is
valid.But if an event occures the callback registration is removed
from server. and i m not able to know it in client side when the
connection comes up.

thanks gops.

[Spani]

I am having difficulty in down loading. Can someone what should I do?
Thank you.