I found EDIT - looks interesting. Especially the opening comment. Spot any keywords in here?
'CONTENT:
' This is a program for a small editor. The editor has pull down menus
' and multi-windowing facility. There are however some major limitations
' to it. It can not open a file longer than 310 lines, with each line
' containing a max of 200 characters. This is basically due to lack of
' linked-list facility in BASIC for storage of file in memory.
Not that you NEED to do it that way, because the existence of QB64.bas as an "editor" is a counterexample to this... but juss sayin anyway...