you spelled it wrong, it's DXdiag not daig. Anyways, DXdiag is a windows program that lets you see your basic computer hardware and maufactor if u bought it from a OEM place. DXdiag lets your vid card to see if it's there, compatible with DirectDraw, Direct 3D, and APG accleration Texturing. It also shows and tests your sound card on different bits. It also allows you to "test" your LAN by chatting to another computer. I find it amusing to look ing there when im bored.