tored in the transport descriptor. The application provides the following information in its call to the message controller:</P>
<UL>
<LI>
The destination is another copy of the same application (thus, it passes its own token).</LI>
<LI>
The user should be notified of the arrival of the message, when appropriate. (The message is travelling First-Class.)</LI>
<LI>
The storage format is a VM tree.</LI>
<LI>
The data format is an address book page in a HugeArray.</LI>
<LI>
The location of the data (the VM file