Software and Advanced Configuration Cont.. System Password - This option is pretty self-explanatory. It allows you to change the password used to enter the router configuration menu for both telnet and web-based configuration. I would recommend changing this from the default of 1234 just for security reasons.

System Maintenance - This option when selected has menu submenus as shown in the picture below.

System Status - Displays the current status of both the LAN and WAN port.

System Information and Console Speed - Allows you to set the speed to which you connect when using serial connection.

Log and Trace - Allows you to view the error log of the router to troubleshoot problems as well as setup the option to forward UNIX syslog's to a specified machine.

Diagnostic Menu - This allows you to troubleshoot problems from the routers perspective by having the router ping a local or Internet IP address as well as release and renew its WAN IP address. This helps in troubleshooting problems. Backup,

Restore Configuration and Upload Firmware - These options simply give you instructions for doing the specified actions.

Command Interpreter Mode - This option allows you to test the router by executing scripts or configuring it by using built-in commands. The built-in commands can be viewed here