I have a folder called "runtimes"  with a folder inside for each character (V4, M4, V3, etc).  Inside each of those folders is a text file named Poser.exe to fool DAZ's installers. Each of these folders has been added to the Poser Library as an external runtime once something has been installed into it.

I don't know that the limit is; I currently have 26 external runtimes...

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