The ACD is programmed with the combination of scripting, application that points to the script and skill/CSQ configuration. All of which is documented here:
http://www.cisco.com/c/en/us/support/customer-collaboration/unified-contact-center-express/tsd-products-support-series-home.html
with programming guides here:
http://www.cisco.com/c/en/us/support/customer-collaboration/unified-contact-center-express/products-programming-reference-guides-list.html
HTH,
Chris