RaiseCallbackEvent but I wait a return ?

[Peregrin]

Hello World,
I explain my problem. A ICallbackEventHandler interface implemente my
webcontrol in a aspx page. A javascript function named LMSGate invokes the
RaiseCallbackEvent but, is my problem, I want this function to wait the
result of GetCallbackResult. So to resume, I want to search a result in a
server by a javascript function. And I have a big constraint, no webservice
(to preserve value in session).
Is there an issue ?
Thanks,