Covering your tracks.

Delete temporay Internet files, history, auto complete, links on favourite list, cookie, clear document menu. When you are visitng a site, it will record the site from you come from and the link which takes you out of the site.

By pressing Alt + Tab, you can toggle between two opened windows.

Email is not a secure form of communication of credit card number.

Common TCP/IP ports : FTP - Port 21, Telnet - Port 23, SMTP - Port 25, http - Port 80.

Password recovery : Always form a strong password longer than 8 character long using both uppper & lower case letters, special characters and numbers. Don't use any personally related name or a dictionary word as password.

Download the shareware from www.download.com and recover the forgetted password.

A 'post' is a message that you send to a mailing list of a newsgroup. A 'thread' is a conversation that consists of several related messages sent over a period of time.