Crestron Tutorial: Button Digital Press Join Properties For A Crestron Touch Panel
The method Crestron uses to connect the Crestron touch panel with the Crestron controller is called a DIGITAL PRESS JOIN. This is simply a unique number that is associated with a specific button. To assign a digital press join to a button, you go to the Button Properties window and select Digital Press Join from the drop down menu marked "Select Property to Modify". (see image below)

A number pallet will open. Numbers that are already assigned will be blue. Since we have not yet assigned any joins, we can use what ever we want. I have used the number "1" for this tutorial. Click OK and you have assigned the button named "My Cool Button" with the digital press join number one.

Congratulations! You have now created the most basic of touch screen layouts - was that fast or what?
All that is left is to compile and upload the code to the touch screen.