|VLK stands for Volume License Keys. You have to setup a software contract with a corporate dealer like ASAP Dell Software. Then you can buy a VLK for as many computers you wish to install the app on. They send you one disk or ISO and it will alow you to install as many times as you like using that VLK. Just be prepared if they decide to do a software audit, to show your certificate for the number of licenses you have.|
"If I buy a Legit copy of xp sp2 from ebay can I use the key to validate a "vlk" install?"
To answer your question, no unless the copy you buy is a VLK version and not an OEM disk. If you have a lagit VLK and just lost your disk you can get the software company to send you another media for around $25 to cover shipping and handling.
Although I never recommend doing this, you can download a VLK ISO off of a bit torrent and use your key instead of the the one provided. Just remember, bit torrents are not legal but download the ISO and useing your key is on the grey side of the law.