Hi, All, When I try to run rc.tcl under/ns-2/tcl/ex/, there is an error said" Can not find file timer.tcl". I also found there is a setence in front of rc.tcl which is "source timer.tcl". Can anyone tell me where is timer.tcl? Thanks __________________________________________________ Do You Yahoo!? Get personalized email addresses from Yahoo! Mail - only $35 a year! http://personal.mail.yahoo.com/