Using an Excel Macro to open an Access database.

I have an Excel spreadsheet which gets some of its information from an Access database. I have written several macros in this spreadsheet using Visual Basic code. I find that gives me more flexibility than just recording my keystrokes. I would somehow like to create a macro in this spreadsheet which would open the Access database and, if possible, run a macro contained in the database.
Since all of my Visual Basic knowledge is self taught, I am not familiar with all of the code. What code should I use to switch from one program to another?
