uncertainty about the script execution in selenium

I'm uncertain about the script(automated test) execution in selenium. I suppose the process is as below: execution starts a selenese command is transformed into an HTTP request. HTTP server of browser driver receives the HTTP request. Browser driver determines the steps needed for implementing the command. Browser driver executes them on the browser. The execution status is sent back to the HTTP server of the browser driver and then to the script(IDE).

I suppose this is the process. Please correct me wherever I'm wrong.