“PROOF on demand” is a set of utilities, that allows to start a PROOF cluster at user request, on a batch farm or on the Grid. It provides a plug-in based system, which allows to use different job submission frontends, such as LSF or gLite WMS. Main components of “PROOF on demand” are the PROOFAgent and the PAConsole. PROOFAgent provides the communication layer between the xrootd redirector/PROOF master on the client machine and the PROOF workers on the batch or Grid machines, possibly behind a firewall. PAConsole provides a user-friendly GUI, and also allows to easily manage PROOF worker job submissions to different systems, which can later function as one uniform cluster. Installation is simple and doesn't require administrator rights, and all the processes run only in user space. “PROOF on demand” gives users, who don't have a static PROOF cluster at their institute, the possibility to enjoy the full power of interactive analysis with PROOF.

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