Open a PDF file from Access

I am creating a Database of adobe pdf files and I want to be able to open the file from access. I want to have a form that opens up the person enters in thier criteria for the search, Then a new form opens with thier search results. I want a button on this form that will say "Display Gram" when it is clicked Adobe will open the file with the focus. How do I create the hyperlink and assign it to the button?