Ok... i've been banging my head against my desk for days and days... How can i stop someone from logging into my website (or once logged in) from opeing a new tab, and browsing with more than 1 tab? I've tried sessions, cookies, etc... but i can't figure it out. The issue is, is that the browser carries the same ID no matter how many tabs are open... the other thing, is if they open a new window... it is still carrying the same ID. When i open up IE (i use FF) it is a new ID, and I can use session checking to track that, and prevent it. the multiple tabs thing works, i know it does... becuase my bank doens't allow it... how can i acheive it with PHP? ( i beleive they use ASP.NET not that it really make a whole hell of a difference). Steve.