It's possible to develop a desktop application that interacts with the backend accordingly, but doing so would also require compiling for every OS requirement. 32bit and 64bit Windows. Linux. OS X. Then you'd also need to make apps for Android, iOS and Windows Phone, PalmOS.
Overall it's just a massive headache. Far simpler with far less overhead just to have a centralized script as a website people can hit up instead. Far more cost effective.