>>I think it depends on what's in the header file. If there are only variables, I still think it's better to include it only once. Variables can be and are modified. What are you doing if you modify a variable (at runtime) and want to keep this new value into another form (that includes the header file)?
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>i only use header files to hold constants...

I just told the same to Tom: "Me too." But the quetion was about a variable in a header file. So, I supposed we are talking about that header file.