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He cited the case of a poker Web site that placed a Trojan horse on users ' PCs when they downloaded the site 's help program . Web-based thin-client software installs either an ActiveX object or a Java class on users ' PCs to let them remotely access applications as time-sharing clients . The remaining major modes are not intended for use on users ' files ; they are used in buffers created for specific purposes by Emacs , such as Dired mode for buffers made by Dired ( Note : Dired . An alternative for organizations that either need to keep firepower on users ’ desks or don ’ t have as many seats to serve is application virtualization , an approach that Softricity is making more attractive with SoftGrid 4.0 . The current version provides a significant performance improvement over previous versions and dramatically decreases the load on users ' ArcIMS services .