Thank you for your suggestions, Danny. Actually, I'm not looking for a shell script to close the client, I'd like to prevent it from automatically starting up in the first place. In fact, it's quite incomprehensible why something so elementary should require manual editing of .plist files or shell scripts to be run. This should be either controllable through the GUI or the OS's system preferences (the Endpoint Security client does not show up under the Login Items). I'll send an email to Amir Yacoby from the TAC and post his reply here.