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Under Windows 9x/ME, when using a dual monitor setup, applications requiring hardware acceleration support for OpenGL will not be able to run (or will run only in software/Direct3D mode) when both displays are active. The most common programs to exhibit this symptom are games based on the Quake II and Quake III engines.
In order to run OpenGL mode in a dual monitor setup the secondary monitor must be disabled from DISPLAY properties in Windows 9x/ME. Once the secondary monitor has been disabled the application should function in OpenGL mode without difficulty.
When Windows 9x/ME detects a multi-monitor configuration (either a dual-ported card such as the RADEON VE or two independent graphics controllers), it will prevent the hardware accelerated OpenGL driver from loading. Instead, the Microsoft-supplied OpenGL software renderer will be used.
Most OpenGL programs will run, though at reduced speed, using this software renderer. However, applications requiring hardware acceleration support for OpenGL will detect that the renderer is not hardware accelerated, and refuse to run.
