>> Where can I find the library of objects?
Tim, you can find the "library of objects" right in the VBA IDE (editor) by pushing the F@ button. This shows the Object Browser, which contains all the "legal" AutoCAD objects.
>> I'm trying to find out what Get_Limits returns.
If what you mean by "Get_Limits" is the Limits property of ThisDrawing (the current drawing), the fastest way is to go to the Immediate window and try typing "? ThisDrawing.Limits". Since this is not a valid statement, you'll see an error message, BUT then try highlighting the word "Limits" with the mouse and push the F1 key. This will send you right to the help on the Limits property, and even displays an example of how to use the property in code.
This ought to get you started.
Lance