Radio Shack TRS-80 Model 100 Basic Manual page 92

This is true also of the Editor. If the Editor is used to modify a program which was
previously SAVEd in RAM, then these changes also appear in the SAVEd program.
You should practice using the Editor to modify your programs. Yau will find that it is
a very convenient and quick way of making changes.
What you have learned:
You have learned how to use the Editor to modify your BASTC programs. In most
cases, it is easier and quicker to make changes with the Editor, than to make them by
retyping entire lines.
86