yes, there is a way as documented in the Portal Admin Guide. try these two links. in case they don't work, search for New Navigation Model and URL Navigation.
http://help.sap.com/saphelp_ep60sp2/helpdata/en/38/76bd3b6e74d708e10000000a11402f/frameset.htm
and here too:
http://help.sap.com/saphelp_ep60sp2/helpdata/en/38/76bd3b6e74d708e10000000a11402f/frameset.htm
there is a minor error in the above doc. i also found mention of Navigation Target or Cross Navigation in the PDK, Java Development/Documentation/Portal Runtime, i think.
what worked for me is something like the following:
http://server:port/irj/index.html?NavigationTarget=ROLES://pcd_content/...path to your iview in pcd depending on your folder,role, workset and page hierarchy.
if you are to use client side js, then try EPCM.doNavigate('ROLES://....');
there is a demo on sdn, try this link. the demo is part of the eBook on Portal Customization, i think.
http://devnetmedia.sap.com/ebooks/ep6/addons/exercises/Navigation_By_URL.htm
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