I don't remember which one, but one of these previous discussions mentions multi-user software... give a read
Win Server is NOT supported http://forums.adobe.com/thread/851602
Not in a Network environment http://forums.adobe.com/thread/771151
-also PreEl see #5 http://forums.adobe.com/thread/1017199
-a work around, of sorts http://forums.adobe.com/thread/957523
-and not on a "domain" http://forums.adobe.com/thread/858977
Thank you. Due to the need to collaborate between various physically separate institutions, I was not thinking of network sharing. Rather, media files would be stored on a web based server and copied to an external hard drive (in my case RAID thunderbolt connected) for faster and more stable access. After modifying, they would be copied back to the server. Different people would work on different parts of the media but not simultaneously work on the same media file. The EDL would be updated most likely from a single institution.
Premiere does not require transcoding of media, which is potentially an advantage, but storing all the media in one format is faster and more stable. I have found problems pulling up transcoded Avid media in Premiere. Avid does not necessarily need to transcode (AMA is available) but that comes at a price for stability.