How do I get my apps from the store?

[Lienutus]

I have a new computer and I installed iTunes and authorized the computer with my account. How do I get all my applications that I have downloaded onto my computer if I dont have my old computer AND if I do have my old computer? I would prefer the without old computer method

 

[Prospekt]

Wirelessly posted (Mozilla/5.0 (iPhone; U; CPU iPhone OS 4_2_10 like Mac OS X; en-us) AppleWebKit/533.17.9 (KHTML, like Gecko) Version/5.0.2 Mobile/8E600 Safari/6533.18.5)

There should be a purchased tab in the iTunes store homepage I believe

 

[Lienutus]

Wirelessly posted (Mozilla/5.0 (iPhone; U; CPU iPhone OS 4_2_10 like Mac OS X; en-us) AppleWebKit/533.17.9 (KHTML, like Gecko) Version/5.0.2 Mobile/8E600 Safari/6533.18.5)

There should be a purchased tab in the iTunes store homepage I believe

ty!