In other words:
The Interface folder holds all the graphics and graphics instructions. Much like a jigsaw puzzle, the Interface folder holds all the pieces.
The INI files hold the picture (or layout) of said pieces.
Thus, if you want to completely backup your interface, then create a BACKUP folder on your desktop. Then, go into your Everquest 2 directory and copy the UI folder into your BACKUP folder. Also in your Everquest 2 directory there will be two INI files you want to copy into your BACKUP folder as well:
EQ2.INI and permafrost_YOUR-NAME_eq2_uisettings.INI
The EQ2.INI file tells Everquest where to look for the jigsaw pieces and the other one tells the game how to layout all the pieces on your screen for your character. Once you have the layout set with your first character, we'll name him BOB the the file name would be permafrost_BOB_eq2_uisettings.ini. To make the layout the same for your second character (we'll call him MARK), just rename BOB to MARK like so: permafrost_MARK_eq2_uisettings.ini. Do this for each character and all of them will have the same interface.
If you have to re-install Everquest 2 then once it's installed you need only copy all the contents of the BACKUP folder directly into the Everquest 2 folder and you'll be good to go again.
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