How to access application variable in a dll project

See more:

MFC

VisualC++

hello all ,
My queries goes like this :

i have an application class in which i have declared a variable . Now in my solution one other project is also there which is of dll type .
Now what i want to do is that i want supply this application class variable to the dll project's some variable .
Now the problem i m facing is that how can i access this dll variable in application class project .

Thanks all ,