POOL.H

The public symbol file NTKRPAMP.PDB for the original release of Windows 10 tells that the kernel is built with the POOL.H header at

d:\th\minkernel\ntos\inc

and draws from it the following type definitions:

Line Number Type
119 struct _POOL_DESCRIPTOR
178 struct _POOL_HEADER
366 struct _POOL_TRACKER_TABLE
383 struct _POOL_TRACKER_BIG_PAGE

The header POOL.H is not known in any Device Driver Kit (DDK) or Windows Driver Kit (WDK).