How should someone using the C API know to prepend "FnTable:"

[mickvangelderen]

I just figured out that when you are calling VR_GetGenericInterface from the C version of the API, you need to supply for example "FnTable:IVRSystem_019" instead of "IVRSystem_019" which is the value of the constant IVRSystem_Version (at least currently).

Am I missing some documentation/information where I should have been able to find this?

Less importantly to me, why aren't IVRSystem_Version and friends defined including the "FnTable" prefix by default? I understand that that would be a backwards incompatible change and that adding C versions bloats the data section. Is there another reason this wasn't done though?

[lemonJumps]

Why is this not documented, I'm seriously getting angry at how lacking the documentation for this api is lacking