[MSDN Library June 1998] #ifndef (34.4576819269022%)

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 (33.6372980367508%)

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