If you want to know if someone is still online, you have three ways to do it:
1) click on the "home" link (its below Trey's photo at the top of the page) and then scroll down to the bottom of the page and the user names of everyone online is listed at the bottom.
2) click on the "my members link" (to the right of the "home" link) and then click on the heading of the first column (leftmost column) until you see little green boxes below the heading - those green boxes mean that the person is currently online.
3) if you look to the left of this post, you will see a small box below my name - it will be white with grey borders if I'm offline, green if I'm online. Applies to everyone and shows on all posts. When you go offline, the system turns the box off on all your posts so everyone on all the threads knows when you've left.
Have fun,
TPC