techblog 

Some people I know use iChat as their jabber client because it supports video over xmpp. However the client is quite rudimentary and there is no way through the interface of setting the priority, which you need if you want to use multiple clients.

However this can be done by editing the config file.

• The file is ~/Library/Preferences/com.apple.iChat.Jabber.plist
• Find the active account you want to set it for.
• There is a setting called Priority and changing that seems to work fine.