I think a great portable app would be something comparable to GOTOMY PC or logmein.com, ultraVNC, FreeNX etc...
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Well most of those aren't open source, but somewhere (please search for it) there is a VNC launcher or some sort.
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Why not get TeamViewer3.
It's already made for PAM and TeamViewer4 is out, but yet it hasn't made PAM menu yet 3: