While using your computer you may get some error with error code of that problem. If you know about that error code, you can easily start troubleshooting the problem. Like you may see error code 4. This error codes happens when system cannot open the file. The error message can be because of virus and spywares also. So, if you get any error message do a Google or Live.com search.

Computer hardware is interface between the computer and other computers and peripheral devices. Whereas software port is virtual data connection that can be used by system programs to exchange data directly, instead of going through a file or other storage location. Ports are very useful for fast computing. Like udp port 67 is Bootstrap Protocol (BOOTP) Server; also used by Dynamic Host Configuration Protocol (DHCP). www.pc-library.com is great place to find information about Error codes and ports.