[Gluk Schmuck]

I have just spent about 2 and a half hours putting the best bits of 2 PCs into one half decent one.

What I need to know is:
1. Is there a thing which allows you to put two blocks of RAM into one slot on the motherboard? If so then what is it called?
2. How do you install a new HD into a PC which already has one? *knows it's hard but wants to try*

That's all, for now.