Any site or web application implicitly collects and store informations for the sole fact that it is accessed.

These data are sent by your browser and saved in log files on the web server whenever you visit a web page.
These informations, which consists of the IP address, the address of the requested resource, date and time, operating system, browser and more, can be use for debugging or security purposes.

RockGlass.com also sets cookies, which are small text files stored on your browser.
RockGlass.com uses technical cookies, which means that they have the simple purpose of making the site functional: these cookies have a short life because they last only for the current session; they will be deleted when you close the browser.
RockGlass.com uses Google Analytics and therefore saves statistical-type cookies in aggregate and anonymous form.

You can remove cookies from the browser's preferences.