You cannot use Lightroom in a muti-user environment: The database used in Lightroom is only able to use a single-user access (e.g. there is no locking available to protect the database from concurrent access attempts from different users. When two or more users try to change the database, it will result in DB corruption). So even if you use the SUBST command recommended by ghassan, you will still not be able to use the application concurrently.
Install it on every computer that needs to use the application, and make sure that the Lightroom database is local as well. You might get away with storing the images that are referenced by Lightroom on the server. Because Lightroom uses a non-destructive editing, your images should never get modified, only read (that is as long as you did not install Lightroom 1.4 which was available for a short time, but pulled back by Adobe a couple of weeks ago).
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by: ghassanPosted on 2008-03-27 at 10:23:23ID: 21223803
Lightroom is definitely not a client/server application. Although I couldn't find documentation about network setup, I should caution you that Lightroom will not use catalogs (libraries) stored on a network share, at least not in straightforward manner, actually, Lightroom will refuse to open catalogs over the network.
I know that wasn't your question but I thought I should caution you. Users won't have access to a centralized library and catalog/library on a local computer will only be accessible by one user at once. Users will have to resolve to importing/exporting images with metadata files (XMP) or catalogs in order to exchange images.
A workaround to access a catalog from across the network is to map the share, use the SUBST command to alias the mapped drive into another drive letter, that way the share will look like a local drive to Lightroom. Again, only one user can access any specific catalog at once.