Where can you play poker at school online

You could play poker online at school if your school is not blocking websites that are flagged under tag "Gambling" or similar.
Most schools are blocking these websites along with social networks like Facebook. If these sites are blocked the only way of getting on them is trough proxies, but these are often nog supporting flash and/or java games.

Information on how to use a proxy can be found on the related links of this question.