Text Editor

Blender has a Text Editor among its editor types, accessible via the Editor type menu, or the shortcut Shift-F11.

Main View

Typing on the keyboard produces text in the text buffer. As usual, pressing, dragging and releasing LMB selects text.

ちなみに

Usages for the Text editor

The Text editor is handy also when you want to share your blend-files with others. The Text editor can be used to write in a README text explaining the contents of your blend-file. Be sure to keep it visible when saving!