Switching Displays/Monitors in Fedora with Gnome and xrandr

This is one is mostly for my own reference. In my case, I'm hooking up my work Latitude to an HP external monitor, and I want the HP to have the main panels and be the main desktop. This must be executed as root, hence "#" and not "$" in example below:

# xrandr --output HDMI1 --primary

Running xrandr without any options will list the all available devices and indicate which ones are connected and in use. In my case, LVDS1 is laptop's monitor:

# xrandr
Screen 0: minimum 320 x 200, current 3040 x 1200, maximum 8192 x 8192
LVDS1 connected 1440x900+1600+300 (normal left inverted right x axis y axis) 331mm x 207mm
   1440x900       60.0*+   40.0  
   1024x768       60.0  
   800x600        60.3     56.2  
   640x480        59.9  
VGA1 disconnected (normal left inverted right x axis y axis)
HDMI1 connected 1600x1200+0+0 (normal left inverted right x axis y axis) 408mm x 306mm
   1600x1200      60.0*+
   1280x1024      85.0     75.0     60.0  
   1280x960       60.0  
   1152x864       75.0  
   1024x768       85.0     75.1     60.0  
   832x624        74.6  
   800x600        85.1     60.3  
   640x480        85.0     75.0     60.0  
   720x400        70.1  
DP1 disconnected (normal left inverted right x axis y axis)
...