Multiple header includes in form application error

Hi, I have a form application that has two header includes, such as...

#pragma once
#include "CommunicationDLL.h"
#include "MathDLL.h"

However, like this i can only access the functions from the first include and not the other. Then when its like this...

#pragma once
#include "MathDLL.h"
#include "CommunicationDLL.h"

I can only access the functions from the first one and not the second. Why does this happen?
> Why does this happen?
Because your headers are awfully designed.
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