How memory is used if we use a dll

Let's say we have an vb6 application. I have a .Net Dll component and am using it in vb6 application.

If I execute some functions/procedures from .net DLL, then more memory will be used by my vb6 application or DLL component will be treated as separate application/process ?

let me knwo
thanks

What are the advantages of using DLL components in my case, other than code reusability ??