external apps can be made to seem like it is part of the signage player application by making the external app's window appear on top of our player's window. however, if its really a component, one way is to make a custom component using webkit which is limited to web interface. the other way would be to create a flash component so you can access the device's hardware - this however is outdated and had been dropped since the release of version 6 of our platform. either of the two options would require research and development on your part.
Note that other than giving you these interfacing options, it is beyond the scope of digitalsignage.com's support to develop this nor will it be prudent for us to share the work of digitalsignage's customer. that said, you can either ask the company directly or wait for a reply from other forum users who'd be willing to share this information.
best regards
-ADMIN