...And what if you don't have any documentation? The only way left seems is to open each and every channel to look out for the exact details. Don't worry. You don't need to do that anymore. We have a shortcut ;)
For details, please check http://scn.sap.com/community/pi-and-soa-middleware/blog/2011/11/10/lets-excel-enhanced-communication-channel-search-in-sap-pi .