It has a few comments, but not many.
Features:
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unit selection
group hotkeys (ctrl + 1-9 to assign group number)
basic unit movement and animation
As I said, this is a bare bone of an engine. If you want to make your own RTS, you still have to do much of the work. Such as pathfinding, building and unit construction.
http://angelfire.com/80s/phaelax/rts-dbpro.zip