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Cash games, also sometimes referred to as ring games or live action games, are poker games played with "real" chips and money at stake, often with no predetermined end time, with players able to enter and leave as they see fit.

A2A: Yes. The IP addresses used by VPN servers are known. You could conceal your own IP by using a private proxy server. Can PokerStars detect VPN?

Yes, it is legal to use a VPN to play at PokerStars if online poker is allowed in your country. However, keep in mind that VPN usage doesn't make an illegal activity into a legal one. So, if you live in a region where gambling is extremely frowned upon, you might still get into trouble.