Are The Workbook Environment And The VBE Environment Simply Two Different Forms

1. Are the Workbook Environment and the VBE environment simply two different forms? Meaning, when I press alt+F11, am I just switching between 2 default forms?

2. Is Excel itself written in VBA? And if it's written in VB or C, which would make more sense, is the GUI side of things written in VBA?

The reason I ask is pretty simple. I really love the way the Workbook environment and the VBE environment are set up. I want to use them as models for my own forms. Both environments seem little more than two very complex forms. And I want to replicate so much about them.

3. But is it possible to replicate anything I see as part of these environments in my own forms?

For instance, what is the VBE Project window? Is it a ListBox? I need to code a form that does something very similar to the way it groups and collapses Projects and their sub-groups like Microsoft Objects, Sheets, ThisWorkbook, etc. I've used grouping to make rows and columns collapsible. But never items in a ListBox... But am I right to assume that I can do so, just because Excel's environment does it? Meaning, can it be assumed that anything I see Excel doing itself, a talented programmer can replicate in forms of his own?