This tweak is used prevent windows XP from using mirror Video driver when accesing some program.

1.Some program or games like Ghost Recon, use alternate Video driver when it can't recognise the Primary Video card driver.

2.Alternate driver lack AGP support and performance. So this tweak will prevent window XP from using this alternate driver whenever it was called for.

3.Some bug may appear when using the primary Video driver

Here's how to do it:
-Run Regedit.
-Go to. --> "HKEY_LOCAL_MACHINE\SYSTEM\ CurrentControlSet\Control\Video"
-There will be 4 'display device GUID' key.
-Expand all 4 key.
-Open the 'subkey' labelled "000"
-Change any 'DWORD' value labelled "MirrorDriver"
from '1' to '0'.
-Close regedit, restart.

4. My graphic card is soo slow (SiS based graphic
card) so, if my AGP texturing capabilities disabled, my computer will go soo slow.
5. I use a program named "POWERSTRIP" to determine my AGP capabilities (and to overclock
my Graphic Card).