You can install the WebSphere Application Server/Portal Server agent on multiple WebSphere Application Server 6.1/7.0 instances on the same host machine. However, you must run the agentadmin program for each WebSphere Application Server 6.1/7.0 instance. During each installation, specify the unique server configuration directory and instance name, so the agent can differentiate the different instances.
You can install the WebSphere Application Server/Portal Server agent on a different web container instance on the same host machine where OpenSSO Enterprise server is installed, as long as the web container is supported for both the agent and OpenSSO Enterprise server. For example, on WebSphere Application Server/Portal Server.