Setting a password for the Symantec Endpoint Security (SES) client allows you to require a password to open the client user interface, uninstall the client, stop the services, or import/export a policy.
SES
To set an agent password:
After saving the policy the clients should pick this up promptly if there are no communications issues.
You can right-click on a clients icon in the System Tray if you'd like to force a client to check for policies by choosing the Update Policy option.