Depends on if you have poser open or not when it does it : p

When you create your external runtime.  I put mine in My Docs and name it EXTruntime.
Inside it I have many different folders (this depends on your organizational tastes- mine are anal) - anyhoo....  Inside each of those folders I initially put a folder named runtime.

SO say I download joeshmoes hair for M3.  I download that directly to MY created HAIR folder inside EXTruntime.  Once its downloaded and in there, I just click extracthere with winrar and it does the rest for me.

Now I want the hair when I am in poser.
So I will click to add a runtime, then navigate to that hair folder.  And howdy do there it is.

So far as I understand it, using external runtimes greatly reduces poser lag. 

I sure do hope you can understand all that.

I am:  aka Velocity3d