What's a compiler? Have you seen those geeky T-shirts that say "there are only 10 types of people in the world: those who understand binary, and those who don't?" If you find yourself scratching your head instead of laughing hysterically, then you don't understand binary. Computers, on the other hand, understand only binary. 1s and 0s. On and off.
I have heard of some people who can do binary code, or machine language in their heads, but the rest of us normal people would have a difficult time writing a computer program out of nothing but 1s and 0s. Instead we use a higher level language like C language to write software.
Have you ever been to a foreign country and didn't know the language? You can hire a translator to translate what you say into the language that the locals can understand. That's what a compiler does. Computers can't understand C language so, a compiler translates the software you write in C language into machine code, or the 1s and 0s that computers can understand.
You'll need to download and install the C language compiler so that you can write programs for the Trakr and compile your software into machine language that the Trakr can understand. The C Language compiler is included in a fairly complete software development kit (SDK) that the folks at Wild Planet call the "Primer." So, download the Primer and save it on your computer where it'll be easy to find by clicking the following link:http://www.spygear.net/help/files/TRAKR_APP_PRIMER_V1.2.zip