Hi,
If you are newly install symantec then use push deployment Wizard.
https://www-secure.symantec.com/connect/articles/overview-push-deployment-wizard-symantec-endpoint-protection-121
If you are upgrading your SEP client then use the Auto Upgrade Wizard.
Upgrade clients to SEP 12.1 by Auto upgrade feature
https://www-secure.symantec.com/connect/articles/sep-121-auto-upgrade
Remoteclient.exe for Remote Branches.