Martin; Thank You, Thank You; No wonder nothing made sense. On Wed, 2005-07-27 at 16:06 -0400, Martin Hicks wrote: > On Wed, Jul 27, 2005 at 04:02:31PM -0400, William Case wrote: > > Thank you Kevin; > > > > Does the port number in the header end up as, or refer to, a specific > > physical location on my computer (memory) or is it just a label that > > tells my cpu which program to call in order to process the message? > > It is just a label. Memory allocation location has nothing to do with > it. > > mh Somehow I had got it fixed in my head that a TCP port was something physical as are a serial or parallel port. All the "listening" metaphors now make sense. Regards Bill