By default, you can have up to 4 simultaneous sessions. This is defined in the "sess" field under the port settings.
The session feature allows for multiple telnet sessions from an attached terminal or PC. For example:
A user logs into the Digi unit and telnets to a host:
#> telnet 192.168.0.1
The user can issue the ] to return to the prompt. You can then telnet to another host:
#> telnet 192.168.0.3 Now you can switch between the two sessions:
<CTRL> ] 1 <ENTER> (return to session 1)
<CTRL> ] 2 <ENTER> (return to session 2)