The service pubsub running on different servers?

Hi,

First of all I apologize for my bad English.I’d like to know if the service pubsub running on different servers . For example, there are two servers Openfire and in a server there is a node on wich an user publish. In the other server there is a user that want subscribe to the node. Is it possible?the service works? communication between servers is done as in the case of IM?

Regard

Selene