How do I position windows?

I've been getting into panel design, primarily tweaking my own panels by moving, replacing, etc. gauges. But the window design escapes me. I want to move and resize some GPS windows and after I get the hang of that afew other popups. I have a panel with this configuration that puts a GPS window in the bottom right, but not in the default position in the corner:
[Window01]
Background_color=0,0,0
size_mm=640
window_size_ratio=1.00
position=0
visible=0
ident=GPS_panel
window_size= 0.226, 0.482
window_pos= 0.774, 0.432
Having read my Panel Design SDK it appears that:
size_mm means the window is 640 pixels - width, depth or what?
Window size ratio=1.00 "Determines the width of panel window as a ratio of the client area of Flight Simulator main window" Huh? If the default is 1, why is this in here?
Position=0 This should put it in the upper left corner, shouldn't it?
visible=0. Finally, a line I understand.
ident=GPS. OK, I understand this one, too.
window_size= 0.226, 0.482
window_pos= 0.774, 0.432 - according to the SDK, I have just overridden the previous size, ratio and position settings.
Should I always set size, ratio and position as above so I can reset them here?
What do the numbers mean? I get the impression they are relative positions, 0.0, 0.0 being upper left corner and 1.0, 1.0 being bottom right.
Anything else I'm missing?
[Window01]
Background_color=0,0,0
size_mm=640
window_size_ratio=1.00
position=0
visible=0
ident=GPS_panel
window_size= 0.226, 0.482
window_pos= 0.774, 0.432
Having read my Panel Design SDK it appears that:
size_mm means the window is 640 pixels - width, depth or what?
Window size ratio=1.00 "Determines the width of panel window as a ratio of the client area of Flight Simulator main window" Huh? If the default is 1, why is this in here?
Position=0 This should put it in the upper left corner, shouldn't it?
visible=0. Finally, a line I understand.
ident=GPS. OK, I understand this one, too.
window_size= 0.226, 0.482
window_pos= 0.774, 0.432 - according to the SDK, I have just overridden the previous size, ratio and position settings.
Should I always set size, ratio and position as above so I can reset them here?
What do the numbers mean? I get the impression they are relative positions, 0.0, 0.0 being upper left corner and 1.0, 1.0 being bottom right.
Anything else I'm missing?