The Read Only command makes the active source window read-only. When you choose this command, the window cannot be edited.
This command is useful when you are viewing a program and don't want to accidentally make any changes to the window.
·To make a source window read-only:
1.Activate the window.
2.From the Edit menu, choose Read Only.
To deactivate the command, choose it again.
A check mark next to the menu command and the word READ in the status bar at the bottom of the screen indicate that the source file is read-only.