How many users are logged on/connected to a server

Sometimes we may need to know how many users are logged on to a (file) server, like maybe when there is a performance degradation.
At the server's console itself, with native commands only:

    NET SESSION | FIND /C "\\"

Remotely, with the help of SysInternals' PSTools:

    PSEXEC \\servername NET SESSION | FIND /C "\\"

By replacing FIND /C "\\" by FIND "\\" (removing the /Cswitch) you'll get a list of logged on users instead of just thenumber of users.