SID structure

The security identifier (SID) structure is a variable-length structure used to uniquely identify users or groups.

Applications should not modify a SID directly. To create and manipulate a security identifier, use the functions listed in the See Also section.

Requirements

Minimum supported client	Windows XP [desktop apps only]
Minimum supported server	Windows Server 2003 [desktop apps only]
Header	Winnt.h (include Windows.h)