I am rewriting an old VB6 Application in VB.Net. As this is my first large vb.net project I need some help understanding the relationship between Solutions, Projects and Files. Here's a summary of my understanding and my questions - I'd appreciate any comments to both correct me if I'm wrong and help guide me on my way.

First, in the VB6 world I had a Solution Folder that contained multiple VBP files. Each VBP had some of its own unique forms and also used some forms that were common to other VBP's - was not a problem since all were in same Solution Folder. Each VBP was compiled into it's own executable and a program selection menu (Another VBP) called the appropriate executable as needed.

Now, in the VB.Net world, a Solution can contain multiple projects and as I understand it, all projects within a solution are compiled into the same executable..... If this is true, how do I have two or more of those projects run at same time?
Also, development code files for each project are kept in separate project folders.... How do we share forms between projects in development? If we need multiple copies of same form it's a maintenance headache.

Is it better to have all compiled projects in one file for distribution or multiple executables as we did in VB6 era.

Any help is appreciated.

Lee