 The Generic Active Message Specification, Version 1.1 defines an Active Messages interface which is portable across a variety of parallel machines. Implementations are available for the <A HREF="http://www.cs.cornell.edu/Info/Projects/U-Net/">U-Net ATM cluster</A>, the <A HREF="http://http.cs.ucsb.edu:80/~schauser/papers/index.html">Meiko CS-2</A>, the <A HREF="http://now.cs.berkeley.edu/AM/active_messages.html">HPAM FDDI ring</A>, the <A HREF="http://now.cs.berkeley.edu/AM/active_messages.html">Paragon</A>, and the <a href="http://www.cs.cornell.edu/Info/Projects/CAM/sp2.html"> SP-2</a>.  <p>
