There (appears to be) no way for an external application to request TS3 Client to disconnect the User from a server, or to close the connections and close the TS3 client applicaiton.
TS3 client does not respond to Windows 'sendkeys' (e.g. sending Ctrl-D) or 'CloseMainWindow' system calls.
The only current option appears to be is to 'kill' the process. I would prefer to close TS3 Client correctly, rather than terminating the process.
It there is no other suitable system, please can you consider it for in a future release.