Quote - if I have more than one runtime will they have to be renamed, eg, runtime1, runtime2.

A runtime is a runtime is a runtime.  People tend to get confused by the term "External Runtimes" and "Multiple Runtimes" thinking that it's all different things and  that they all work differently when they don't.  I found that out the hard way after spending 3 months  (yes, it really was 3 months) trying to help my friend set up her files. I was sooooo frustrated that she just didn't get it even after I hooked up to her and gave her a visual walking tour of my runtime setup!  Then out of the blue it hit me that she could possibly think they are different and behave differently than the runtime inside the Poser 6 folder.  Sure enough that is what she thought, and the light bulb finally went on,  LOL

Anyway, all an "external runtime" is, is a runtime that sits outside of the actual main Poser program's folder.  You can put them anywhere on your hard drive you want, even an external hard drive.  There is absolutely no difference between them and the one in the Poser program folder, other than the location on your hard drive :)

You will of course have to name each one differently otherwise they will end up all lumped into one.  For example:

V3
SP3
M3
props
poses
cartoon figures
aiko
animals

etc.

You can of course break the runtimes up in any fashion you like. Those are just some examples.  You could also decide to have a runtime for V3's clothing, and another runtime for V3 character addons if you like more organization.  Or you might decide to put V3, SP3 and Aiko into one runtime as they can share skin textures, and many clothing items come with fits for all 3 of them.  The choice is entirely up to you. 

Decide on a location and names for your runtimes.  Create a folder  for each one and give it the desired name.  Open each folder that you created and create a new folder in it. Call this one "Runtime".  Create a new text document (leave it blank), and name it  poser.exe. You will get a message that the file may not work. Say OK.

That's all there is to it.  Just install the desired items into that runtime like you would normally do if you were installing into the main poser runtime.

Once you have your runtimes set up, all you do is add them to your library in Poser. For example if you have a  Props runtime, add that folder  (the one that holds your "runtime" and "poser.exe") to your library.  When you want to use something from that runtime, just browse for it, open it and access the files.

For Daz products, you will have to put a copy of the !DAZ folder which is found in your Library folder, into the same spot in your actual Poser runtime.

You can of course do one runtime and sub divide the contents that are in the Library folders.  For example  could make sub folders for V3, SP3, M3, props, etc. Then all your files for a particular figure are located in one folder in characters, poses, props, faces, camera.  You can further sub divide those folders to break up the contents even more.  For example in your V3 folder you could have  "clothing", "shoes", "hair', "poses".

Poses and hair tend to be able to be used cross figure with tweaking of the parameter dials, so I like to keep those in a folder all by themselves so that I can take advantage of all of the hair and poses that I have, and not just hair and poses for the particular figure that I'm using.

Ok, I'll stop now that I've totally confused you,  hehe

"It is good to see ourselves as others see us. Try as we may, we are never
able to know ourselves fully as we are, especially the evil side of us.
This we can do only if we are not angry with our critics but will take in good
heart whatever they might have to say." - Ghandi