Hi Sherif, Did you get an opportunity to read the ns notes and documentation on agents? There are descriptions, a cookbook and some examples. Also, check out the workshop slides, esp. my slides on the OTcl-C++ duality. You can get all of these off the ns documentation web page, at http://www-mash.cs.berkeley.edu/ns/ns-documentation.html Kannan -- [email protected] http://www.isi.edu/~kannan