How to assign programs to interactive buttons:

     First click on interactive buttons in the configuration options. Then, to the
 right, you'll see numbered button that say System-External Programs. Click on one
 of them and on the bottom right where it says External Program Information, below
 that, Ext. Source, There's a small grey box. Click on it.A window will open up
 allowing you to navigate to the program you want. Click on the .exe and done!
Sysmetrix will do the rest. To open that program just click on that button. 