To update the mail address of Denys Smithers:
emdir
Emdir> Query
;;; information for Smithers is displayed
Emdir> Update
Update> 8 smithers@dxcern.cern.ch
Update> Go
Emdir> Exit
After the Go command you will be prompted for a password which will be
requested before all future updates. If you have forgotten this password from
a previous update, contact emdirmgr@vxcern.cern.ch. For more information use
the online help.