some computer Tips !

1- to rename a file or folder (mark it with single click and press F2 . write the new name)

2- some default ports for well known services (protocols):

      telnet      port  23
      ftp          port  20 & 21

      smtp       port  25

      http        port  80

      https       port  443
      pop3      port 110

      ssh         port 22

3- on your internet explorer address : you can write the .com  fast by writing the site name  without .com  and CTRL+Enter , the site name with .com will appear and it opens that site.