help avoid multiple login

-----Mensagem original----- De: Jochem Maas (...) the normal way of doing session 'closing' is by way of 'garbage collection' - every now and then a script/process/function is run that 'closes' any sessions which are (according to your criteria) inactive. php has stuff built it that will do this for you to a degree. ----- Is there a way I can access sessions from other users on a script? If yes I could store the session id on a table and later check if isset. Thanks for replying. Pedro.