Editing Abap coding can be done in Notepad as well, but it would of course lack a lot of Abap editor functionality. I like to use freely downloadable Notepad++ (download here) for my off-system editing or viewing Abap coding.
As I do have a small library of Abap coding objects which can be (re)used, I tend to lean on Notepad++ to view or edit these files. It is a simple editor which allows multiple windows to be accessible (which would be a nice addition to the SAP SE38 editor) but it also recognizes the structure of Abap coding, if you follow these installation details from SDN:
SDN: abap syntax highlighting in notepad
Have a go why don't you.