or a stand-alone package I can integrate into a Joomla page? Basically I have 4 clients who need to access 10 files online. They want to have a system so that if 1 person is working on the file, the file is "locked" for editing by the other 3 until that person puts that file back. Not sure if I I've explain it properly. These are things like lease agreements and each person has a specific role in the agreement, so they want to make sure they are always on the same agreement so they can present the proper one to their client. ideas?