What is this? "C" NoDebug

Just saw a method signature like this in maxmod.

Method FillBuffer(SoundData:Int,Length:Int)"C" NoDebug
'snip!
end method

Whats that decoration for at the end?

it prevents the debugger from doing anything inside that function

And the C means that it is a CDecl Method ...

Don't ask me why this one is there, that would somehow only make sense on functions that you export from a DLL somehow ...