[MSDN Library June 1998] #ifndef (48.9417989417989%)

MSDN Library Visual Studio 6.0 > Platform SDK > Windows Programming Guidelines > Platform SDK Tools > Compiling > Using the Resource Compiler > Resource Compiler Reference > RC Preprocessor Directives

[MSDN Library April 2000] #ifndef (41.2525879917184%)

MSDN Library - April 2000 > Platform SDK > User Interface Services > Windows User Interface > Resources > Resource Compiler > About Resource Files > Preprocessor Directives