question about clipboard behavior

Hi all, I have a question about the standard clipboard. Highlighting some text in an app, may it be firefox, thunderbird, tomboy, whatever and then pasting it to an existing xterm with middle mouse button works. However if you open a new xterm _after_ you highlighted some text the previously highlighted text is not being pasted to the new xterm. There might be some some security concerns I might not be thinking of but it's not the behavior I would expect from a user perspective. What's actually going on there? Stefan -- Stefan Assmann | Red Hat GmbH Software Engineer | Otto-Hahn-Strasse 20, 85609 Dornach | HR: Amtsgericht Muenchen HRB 153243 | GF: Brendan Lane, Charlie Peters, sassmann at redhat.com | Michael Cunningham, Charles Cachera