Source code of Windows XP (NT5)
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; Whenever a module registers a group of callback thunks with win32c.dll,
; it uses a unique 16-bit Callback Client id to identify the group.
; We're using fixed numbers for the standard system dll's for convenience.
; We may add an id allocator to win32c.dll for use by third-party modules.
;
; Rules for CBC id's:
;
; - CBC id's are 16-bits wide.
; - The value 0 is reserved. Don't ues as an id.
; - CBID_MAX is the largest id that win32c.dll supports.
; - CBID_FREEUSE is the smallest id for use by third party developers.
; All id's below this value are reserved by MS.
CBCID_KERNEL equ 1
CBCID_GDI equ 2
CBCID_USER equ 3
CBCID_COMMDLG equ 4
CBCID_SHELL equ 5
CBCID_LZ equ 6
CBCID_OLE equ 7
CBCID_ADVAPI equ 8
CBCID_WIN32C equ 9
CBCID_PEN equ 10
CBCID_FREEUSE equ 20 ;Id's less than this reserved for MS
CBCID_MAX equ 29 ;Largest id allowed.