I just learned about the "Office Developer" described in the following MS
article:

http://support.microsoft.com/kb/306130/EN-US

1) How can I find out if it is installed on my machine?

2) How can I learn more about this?

3) Is it a good tool to use for developing Add-in's or should I not bother
(I'm new to Add-ins, but not coding, I would like to explore possibility of
add-ins)?

Thanks much in advance for your assistance.