Ok so new girl here, be kind!

Just some simple questions.

1 If I add a triple head card, what happens to the onboard graphics? do they come out when i put a x3 card in?

2 im working on a cat system next week but won't have access to it until the bump the day before. am i able to program on my g5 here and then transfer my programming to that cat? if so, how do i do that and make sure my libries work.

3 how easy is it to operate catalyst without a dmx console, is there some way to easily and quickly play back q's accross a local machine (only one cat at this stage) - it would keep costs down if i didnt have to use a console.

would you recoment the above?

Thanks for answering my beginner questions.