You can run multiple open connections concurrently. If a connection 'times out' and is disconnected from a server, it remains disconnected until it is required, and then re-connects automatically.
To open a connection:
In Serena Explorer, right-click on the Dimensions and select Connect To | <connection>.
The Login to Dimensions dialog box appears and displays the log-in details for the connection.
Enter the password for the operating system user that you wish to log-in as, and click the OK button.