Dear Sumit: 1) I am afraid that you are attempting to stretch UDPcast towards the opposite direction of what is its original intention, that is, to distribute update files to multiple client PCs in one shot. This is what the counter in Sender is for. 2) If there are 10 clients to receive update files, the Sender can start the "batch" job once the counter has reached 10. On the other hand, if one or more receivers failed to log in, the person in control of the Sender can make a decision as whether to wait or to send update files to those already logged in, leaving the last few to be dealt with later in additional "batches". 3) Looking for additional Receivers in the middle of broadcasting files to those already logged in will demand for more processing power from the Sender. With the procedure available in Pt. 2), this complexity is not justifiable. Hope my reasoning makes sense to you. Regards, Abe (2010-07-02, 12:25)