If you do not log off, another person may come along to the computer you were using and be able to access your WebCT account. Even if you have "surfed" on to other sites not related to WebCT, you must still quit the browser, because anyone could use the Back button on the browser to access the WebCT course under your name. It is possible that they could view your marks, post messages to the Discussion Area using your name, check your email, make public or private postings to the calendar, etc. This could cause problems for you, so remember to quit the browser every time you are finished using WebCT.