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Mr. Burl presented a series of slides showing the changes / improvements in the physical campus over the ten years since the plan was initiated . For example , Marc Branchaud of RSA noted that " the directory is the main thing that makes X.509 work , " and Peter Alterman observed that " solving directory issues is the key to interoperability . The check is in the mail , and it will take three years to get here . The ability of an agent to push , pull or otherwise manipulate the content of callers ' PCs through a browser is nothing new , but the ability to work with the contents of their Web-enabled mobile telephones or PDAs is a blank canvas for which developers are just beginning to dream up applications . They are designed to sense when a line is in use and block the protected phones from gaining line access .