Very little info here to even start to help ...

If you are on about running an ASP or ASP.Net application in a Clustered
Server environment then each request a client makes through IE may not
be dealt with by the same server. The cookies generated by IIS for a
client Session are unique to each server within the Cluster. There are
several solutions to this scenario.

1.  Configure "Sticky IP's" on your clustered server array so only one
server deals with a single Client.

2.  Deal with Session and State management yourself by preserving the
data to another source. IOW persist your data to either a database (ie:
SQL Server) or a COM+ object. This single resource persists data for the
cluster however, each page will need to get the persisted data from this
single source before processing (ie: you can't use default Session
management).

If I am completely off track then sorry but as already stated above you
are not providing much information on what you are trying to do.