myDll.dll + myDll.h - is it enough?

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Hello,

I have "hello world" application that
uses simple function from dll I have compiled (myDll). Is it enoug to
have just myDll.dll and myDll.h to compile application? Everything
goes fine when I add *.o or *.a file to linker, but really I need to
do that?

What files I need to distribute to allow others access functions to
myDll?

If I need to distribute *.o and *.a files I suppose they will not be
OK for different IDE/compilers/linkers?

Thank You