The HOSTS File is a DNS IP Address Mapper that Over-Rides the DNS Client Caching Service. It can be used to BLOCK Parasite Crap like Intellitxt, doubleclick, Vibrantmedia ...etc to 184.108.40.206.0.1 and firmly Designate an IP Address of a DNS Server. You wil never see another Ad ;o)
Check this Site Out: http://www.mvps.org/winhelp2002/hosts.htm
I make a HOSTS File Editor by linking a ShortCut of NotePad to the HOSTS File in Windows\System32\Drivers\etc\HOSTS. RTClk the ShortCut Properties and in the Target Enter " D:\Windows\system32\notepad.exe D:\Windows\System32\drivers\etc\hosts" or C if your OS is on C: and open the Advance Button and Clk to Run as an Administrator.
You can create HOSTS.EXE Self-Extractor with WinZIP and Over-Write the HOSTS file anytime and its effective Immediately.
That Site gives you an easy BAT - Over-Write and BackUps your existing HOSTS file.
I've been doing this since 95 and believe it's the easiest and MOST Effective Ad-Blocker there is. - It really gets me when Gimic SoftWare Ad's - LOL - Try to get you to install their Ad-Block Bowser Plugins that are Virtually usless and time consuming.
Very Simple DNS IP Mapping - shish ;o)
By the way if you want to find DNS IP Address use this site http://www.kloth.net/services/nslookup.php
For instance if you want TC Site to load FAST like your Camaro type:
220.127.116.11 (2 spaces) then www.camaros.net
into your HOSTS File
If you want to BLOCK Intellitxt Type:
Do that then click on the Intellitxt.com link - LOL
You can DISABLE the Entry simply by placing a # in front
That MVPS Site does have an Excellent Up to Date HOSTS file - It's not that big that you can't run your DNS Client Service However I would recommend that you FLUSH the DNS Cashe by Typing " "ipconfig /flushdns" in CMD.
If you're not on a NetWork you can experiment and DISABLE DNS Client in Services, if you get excess Time to live Hops just Set it back to AUTOMATIC.
I know - I'm a GEEK
PS: If you are truly want to learn about PC HardWare and Software load a mIRC Client and drop into either Freenode ##Windows or DalNET #Windows95. Believe me there are members there who won't admit they are MSCRTS because the GEEKS have it all over them.