Hi, I have a mediawiki installation at: http://wiki.koolsolutions.com/ I would like to share documents like .doc, .ppt, .pdf, .xls file with my clients through the "upload File" section. This is what I am looking for: 1. Each client will have separate permissions i.e. a file uploaded by client 1 cannot be accessed (view/modify/delete) by client 2. 2. As an Administrator if I upload a file I can specifically assign which client has access to the file. 3. A client can also see what files are uploaded on the wiki to which they have access only. 4. Not anybody can register on the wiki. I specifically create user accounts for my clients and send them their login info. 5. Similarly for the pages on the wiki, I would like to assign specific permission to my clients to access them. I guess the best thing would be to create a separate ground for each client? What all extensions will I need in order to achive the above? Is there any best practice for this kind of a scenario? Your thoughts/inputs are highly appreciated. Thanks!