ways to inter-portlet-application-communication(inJ2)

[Thomas . Koch]

hi together !

if i am looking in the internet for ways of interportlet-communication i 
found
a lot of description, how i save a object in session.

now i have 2-3 questions to this:

1.      is it true: ? when we speak from the application_scope, we speak 
from the scope of the portlet-application
        and not of the scope from the portal or portlet container ?!
        so it's not possible to change data between two 
portlet-applications like this:
 
 portletSession.setAttribute(key,value,PortletSession.APPLICATION_SCOPE);

2.      as a result of this, we have to develop ways with other 
tecnologies, like webservices, RMI, SOAP etc. ?!

3.      existing way's in J2 ?

best regards

thomas