What Does "0 users" Mean?

[NAS-Plus]

I notice in the System Information page that it lists the Uptime and "0 users". What does "0 users" mean? I never see that it lists any other number than 0.

 

[m0nkey_]

Number of users attached at a console, serial, telnet or SSH sessions to the server.

 

[NAS-Plus]

Number of users attached at a console, serial, telnet or SSH sessions to the server.

Thanks!