Help out a Crestron newbie please!

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Hi, all! Okay, here's my situation ... We have a Crestron programmer who has decided to leave the country and now we're stuck. I've got all this Crestron equipment -- touch-screens, wired, wireless, etc., and a lot of programming that's already been done... but it's not finished. Some buttons turn on/off some TVs, change the channels, blah blah etc etc... typical stuff. Now, here's the kicker -- I need to learn this stuff and take over the project. My background is in serious programming. I have a formal CS degree and worked with every language from Assembly to .NET. I'm a very good programmer and engineer, but what I don't know is anything about Crestron programming, and I find very little resources out there. I need to learn this, and learn it quick. I've done lots of automation with digital I/O units and various other serial I/O and what-not, and from the crappy stuff that I see this person created, I can't imagine this is too difficult. My question is -- how to begin? What's the language? Where are the resources? Compilers? A book or two would be nice? Can someone recommend where to begin? He left me with all the "password codes" to the units themselves, which I presume are used to load the software, but what do I use to edit it and define the I/O points, etc? If someone could steer me in the right direction, I would be greatly appreciated! Thanks, guys.