When i open a project, its blank? (noob, sorry)

hello. when i try to open a project, such as the boot camp or sewer demo, it come up blank. i think im doing it right, file>open project. both are in the menu automatically, because i've used them recently, and they worked then. (I'm really new, so please explain simply. i got Unity for a web class, so we're all kind of confused about simple stuff like this.)

Hi,

You actually need to select a scene ( *.unity), in a given project you can built several scenes and switch between them when authoring AND during the gameplay itself as well.

It's explain in details here ( also I agree it could be made clearer both in the manual and in the interface itself)

http://unity3d.com/support/documentation/Manual/Learning%20the%20Interface.html

in bootcamp demo:

In the project tab, double click on "bootcamp", it has the disctinct unity icon.

Bye,

Jean