The following notation conventions are used in this reference:

NULL

The term NULL applied to a parameter is used to indicate the presence of the pointer parameter, but with no value.
NULLHANDLE
The term NULLHANDLE applied to a parameter is used to indicate the presence of the handle parameter, but with no value.
Implicit Pointer
If no entry for a data type "Pxxxxxxx" is found in Data Types, then it is implicitly a pointer to the data type "xxxxxxx". See Implicit Pointer Data Types for more information about implicit pointers.
Constant Names
All constants are written in uppercase to match the header files. Where applicable, constant names have a prefix derived from the name of a function, message, or idea associated with the constant. For example:

WM_CREATE

Window message
SV_CXICON
System value
CF_TEXT
Clipboard format.
In this book, references to a complete set of constants with a given prefix is written as shown in the following examples:

Window message

WM_*
System value
SV_*
Parameters and Fields
Function parameters and data structure fields are shown in italics.

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