From left to right, this is: button #, x, y, width, height, x3, y3.
This is the command you use to create and initialize buttons. Button numbers start from 1.
The resultant button starts at position (x,y) and is (width,height) big.
When a mouse cursor comes over the button, it will shift leftward and upward by x3 and y3 pixels, respectively.
Look in the btndemo/ folder of the SDK for example script.