Access 2000 SQL Statement

I build a Multi Select List box which puts the following code into a control called Items. [Forms]![Form1]![Items]

Right now Items = Select Name, activity from Table1 where [activity]=MA OR [Activity]=MD OR [Activity]=MS ;

How do I run this SQL code from a button on the Form called Form1????????????

Thanks for your help….
Alan
abramowitza@coned.com