Here's a quote directly from msg24_7 in a response posted on another forum elsewhere (different website). He explains it neater than I could.

You can edit LibraryPrefs.xml using any texteditor. It takes two minutes to rearrange all your external runtimes. Just make sure you close Poser before editing the file and make a back-up of the file. On Windows those files are located at ... Poser 8: c:Documents and SettingsUserApplication DataPoser8.0 PoserPro 2010: c:Documents and SettingsUserApplication DataPoser Pro2.0

For every connected Runtime you'll find a line looking like this: ContentFolder folder="path to runtime" index="1" searchIndexed="1" Now you can cut and paste all those lines to your liking and change the index numbers accordingly.

That's in response to sorting multiple runtimes which depending on the number of runtimes you have might help. You could in theory move the other Poser library to the bottom of your list.

The dust settled, thinking "what a fine home, at least for now" not realizing that doom would soon be coming in the form of a vacuum cleaner.