Yeah... I dunno. I burned CDs of everything by ranges of file name (Alphabetical) and some that was filed by catagory (Clothes, Hair, etc.). I intend to install so much as possible on a "as-needed-only" basis... but when you suggested in an other thread creating Runtimes by character (Don and all his stuff, Judy and all hers, etc.) was it for ease of use (to keep the libraries organized) or was it for memory optimization? Mainly it is that my libraries aere very dence so I guess "by character" makes sense plus a Runtime for Hair and miscalanious props.