+ <li><a name="session">session</a>
+ <ul>
+ <li>sessionnum - primary key
+ <li>portnum - <a href="#port">Port</a>
+ <li>svcnum - <a href="#svc_acct">Account</a>
+ <li>login - timestamp indicating the beginning of this user session.
+ <li>logout - timestamp indicating the end of this user session. May be null, which indicates a currently open session.
+ </ul>
+