A client-server computing system includes a computer cluster for hosting certain resources, applications, programs, processes, files, and/or data that are published to users who are accessing the computer cluster remotely. The computer cluster includes a network of one or more host computers, a gateway server, a gateway service database, a user database, and a document database. A single sign-on (SSO) method of the disclosure includes performing a computer cluster authentication process in which a user enters his/her credentials followed by a resource authentication process and/or document sharing process in which there is no need for the user to reenter his/her credentials, having entered them already in the computer cluster authentication process.