User-defined Macros
Visual C++ enables you to create custom macros for building projects in the integrated development environment. Macros that you create are called user-defined macros. You can use the Add User Macro Dialog Box to easily create new custom macros.
User-defined macros are defined in .vsprops files. For more information, see XML Schema Definition for Property Sheets.
See Also
Reference
XML Schema Definition for Property Sheets