how do poker sites reconize your computer u logg in on i know ip address and cookies is there any other way they can

UB urinated on your hard drive, so the stink of cheat stays on your computer forever. Other sites have other ways.

there are a lot of ways this can be accomplished.

for example, CPUs often have unique keys on them that can be checked.

also, your network card has a unique identifier code called a MAC address which contains information regarding the chipset manufacturer and so on.

plus, some applications will create registry keys or other system-based identifiers, although these are of course destroyed when you re-install the operating system, and generally are not relied on for security.

the bottom line tho is that there are many ways to skin that particular cat, and there is no one method that is consistent across all poker sites to my knowledge, but almost all of them look to your hardware for unique identifiers.

its worth noting that this information can be obfuscated through DLL injection or other lib-specific means.

eg, you can instruct the system that when a certain function requests the MAC address of your network card, you can pass it a fake address.

this is non-trivial to the point of impractical however; it can be defeated by the application by asking in ways that are not expected, plus it could break legitimate application-layer queries for the same info.