The Project window displays a list of all the forms, modules , and custom controls in an application.
To open a new project, choose New Project from the File menu.
To open an existing project, choose Open Project from the File menu or use the toolbar shortcut:
While working in the Project window:
You can open the Form window for an existing form by selecting the form name and clicking the View Form button.
You can open the Code window for an existing form or module by selecting a form or module name and clicking the View Code button.
You can open as many forms and modules within a project as you want, but you can open only one Project window at a time.
Learning Visual Basic:
How Visual Basic Works
Chapter 2, "Your First Visual Basic Application"