Windows 10 Why is there a +1 or -1 on a buffer or cast?

ExylonFiber

Active Member
I cannot figure out why +1 or -1 is added to a cast or a buffer such as,

Code:
firmwareRequest = (PFIRMWARE_REQUEST_BLOCK)(srbControl + 1);

as listed on the MSDN page:

I searched google and could not find the answer as to why this practice is implemented in programming pertaining to buffers and structures in particular.
 
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