3. Everything in BrainStorm is an entry...
Each entry in BrainStorm is identified by a button in the left margin. An entry can be anything from a blank line or a single character to multiple paragraphs.
A BrainStorm model starts with a root entry called the Title, signified by a T in its button. This is the only entry that cannot be moved. But it can be edited and is offered as the default file name.