I have a document with several artboards. I start drawing rectangles on the first artboard....how do I "select" the next artboard to draw in ?
You use the crop areas suite to deal with artboards. I'm pretty sure if all you want to do is draw on a different artboard, all you need to do is use the right coordinates though.
If you really want another artboard to be 'active' you can do it in code, but like btemp said, you don't need to do that in order to draw on them. Artboards are basically 'print areas'.