Probably some client-side scripting (of which, Javascript is one). As far as no admin/mod abilities... that depends on what the forum allows in its signatures... they evidently allow scripting. As far ...

Cookie · JavaScript · IP address · User agent · It is very simple to make user tracking possible without using browser plugin such as FLASH and JAVA Browser cache was. If you do not accept cookies, ...

The nomenclature of the web is vast. But even though words become commonplace, people often don't know what they really mean. But they should. An IP address, for instance, is a ubiquitous part of the ...