Okay, to "swap" windows, here is what you need to do.
Open your EQUI_PlayerWindow.xml and EQUI_TargetWindow.xml files (using a text editor, Word, WordPerfect, NotePad, etc. blah blah you know the routine
)
In the Player Window, copy the information on each of the four gauges (Player HP, Pet HP, Mana, Fatigue). Paste them into your Target Window. Rename them so that you won't get Duplicate Item error messages. I usually run with something simple like:
<Gauge item = "Player_HP">
becomes:
<Gauge item = "TW_Player_HP">
with TW standing for Target Window. Don't forget to add it down in the <Pieces> section also, using the same new name that you gave it.
From the Target Window, grab the information for the Target Hp bar and copy it to your Player Window. Rename as you did above (ie PW_Target_HP) and add it to the Pieces section also.
DO NOT DELETE ANY INFORMATION FROM EITHER WINDOW. You will crash out if you do, or if you are lucky, just get dumped to default.
Now, for each of the gauges in the original windows (Player HP, Pet HP, Mana, Fatigue in Player, Target HP in Target), set the sizes to 0:
<Size>
<CX>0</CX>
<CY>0</CY>
</Size>
That way, the original gauges won't show, yet they are still there, so EQ won't gack and die on you.
You will also need to adjust the sizes of the windows themselves to accomodate the new information in them (Player becomes smaller, Target larger, if those are the only changes you've made)
Save both and viola, you are done. Target window now flashes during attack and Player window doesn't.