>What is the simplest way to see if an app (non-foxpro) is sending to a port? In other words, what is the simplest possible way to listen to a port and hear what's coming through, if anything? I don't care for a VFP solution, just anything quick and dirty. DOS, whatever... Thanks!

in DOS:
netstat

for Windows:
program called x-NetStat - its reallly good.
http://www.freshsoftware.com/xns/pro/