Use the psexec tool to run the command on any othe remote system
http://technet.microsoft.com/en-us/sysinternals/bb897553.aspx
*Edit*
For 11.x use "Luall.exe" command
For 12.x use "SepLiveUpdate.exe" on the
path C:\Program Files\Symantec\Symantec Endpoint Protection
C:\Program Files (x86)\Symantec\Symantec Endpoint Protection