If you are remote login into Windows 2003 Server. And here you are not find any option for restarting the server.
You only have Logoff/Shutdown option.
To restart the Server Remotely, you need to fire the given below command.
Shutdown /m \\computername /r /c “Remote Restart with Reason” /t 30
The complete explanation/option of all the Shutdown given below
/? Displays the Help listing
/i Displays the graphical user interface (GUI); it must be the first option
/l Logs off the current user; it cannot be used with the /d or /m options
/s Shuts down the computer
/r Shuts down and restarts the computer
/g Shuts down and restarts the computer and then restarts any registered applications
/a Aborts system Shutdown
/p Turns off the local computer with no timeout or warning
/h Hibernates the local machine
/e Documents the reason for shutting down the computer
/m Specifies the target computer; it is used with \\ computer-name
/t xxx Where xxx is the number of seconds before Shutdown
/c “comment” Where “comment” is the reason for the Shutdown or restart
/f Forces running applications to close without warning users
/d [p|u:]xx:yy Provides the reason for the Shutdown action: p = planned; u= unplanned; xx supplies the major reason code; yy = supplies the minor reason code