Cisco: Switch between Telnet Sessions

You can switch between sessions by escaping one session and resuming a previously opened session, as follows:

Step 1 Escape out the current session by pressing Ctrl-^ X and return to the EXEC prompt.

Step 2 List the open sessions using the where command. All open sessions associated with the current terminal line are displayed.

Step 3 Type the resume command and the session number to make the connection.

You can also resume the previous session by pressing the Return key.

source: http://cco.cisco.com/en/US/products/sw/iosswrel/ps1818/products_connection_guide_chapter09186a00800805db.html#xtocid1616712