proceedure to implement sso

Hi,

We have ep installed on one server and sap hr module implemented on the same server, but now we have another module srm to be implemented on the portal which resides on another server, so can sso be achieved even if srm resides on another server, an if no if srm has to be implemented on the same server as ep.

Please let me know what are steps to be followed to achieve sso.

Thanks in anticipation,

Swetha