Hi all friends,

My tomcat(4.0.1)is  running on Port:8080 and Port:80 .I want to know why 
it is running on Port 8080 and 80 why not 10,20,50,70,60,1000,2000 etc.My 
weblogic server are running on Port:7001 and Java web server on 
Port:8080.I know that we can change the port number by modifing the 
configuration files of all server for example tomcat server.xml.
Actually I want to know how peoples are fix the port numbers(what concept 
behind it).For fixing the port numbers what factors should be consider.

Regards
Bikash