creating render or action url for other portlets

[Brice Lambi]

Hello,

Is there anyway to create a render (or action) url for a portlet other than
the one that is executing?  For example I have portlet A and B, in doView of
A I would like to create a render url for portlet B.  Is this possible or is
there a way to invoke a portlet using the ajax API?

Thanks,
Brice