The settings that control the startup of the video system are located in 
settings\client_system.cfg.  If for some reason a video change causes 
Gore to be unable to start, these settings can be manually adjusted.

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Setting:
driver

Function:
Controls which dll Gore uses for open gl.

Default:
driver opengl32
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///////////////////////////
Setting:
fullscreen

Function:
Controls whether or not Gore starts in fullscreen or windowed mode.
Acceptable values or 0 or 1.

Default:
fullscreen 1
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///////////////////////////
Setting:
res

Function:
Sets the display resolution (or window size) that Gore operates in.

Default:
res 640x480
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In case of difficulty, the defaults are the safest bet.  Some older cards, such as Voodoo may require alternate driver settings.

