Using the chord finder is basically making selections.
For example, select A, Then select variation 2, it will bring up finger placement.
The red dots being the root note the white your Fourth or fifth, and X string note played. If you go back to the first variation you will see finger placement for open chord. You can place your cursor over any string and fret and see what that note is. You can go back and select another key and/or min, dim or aug .
This was kind a backward way to figure out the chord structure you had in question, but I am poorly versed in theory.
The other link ( http://www.gootar.com/guitar/ ) you can place your cursor where it matches your chord fingering and it tell you the chord name. This is good when other only can show the chord but don't know the name. It also uses the cursor to select sting and fret. This is a sample program and I could not find how to X an unplayed note.
I hope your note as confused as I am..
