How to access a MS Access DB

I need to know exactly how to hook up to an Access database under Office Xp. I normally use MySQL, but the current site sits on Windows servers. I am using php 4.3.0 Office Xp Pro w/ Access I'm running Apache 2.0.43 I need to know how to check if ODBC is set up on my machine (I hear that by default it is) and what's this about a driver? All I know at this point is odbc_connect("XXX","username","password"); Where XX is the DSN name I will be using, (how do this, i.e. set up a DSN name) Thanks much and in advance.