What's the exact meaning of the weired linker option : /DRIVER:WDM

[xmllmx]

I don't know if you have noticed the weired linker option : /
DRIVER:UPONLY and /DRIVER:WDM. To me, the /DRIVER:UPONLY is easy to
understand; however, /DRIVER:WDM is hard to understand its
necessaries. Because from the image loader's perspective, there is no
difference between a WDM driver and a Non-WDM one.

MSDN vaguely says as follows:

The WDM keyword causes the linker to set the
IMAGE_DLLCHARACTERISTICS_WDM_DRIVER bit in the optional header's
DllCharacteristics field. WDM video capture was designed to resolve
the problems inherent in the Video for Windows architecture.

I cannot understand the statement. Any explanations?

Thanks in advance!