How to copy files to all machines using puppet master?

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http://askubuntu.com – I have installed puppetmaster in ubuntu 11.04 and i have installed puppet in all my clients. I have joined all my puppet clients with puppet master. Is it possible to copy a file to all these puppet clients from puppet master? For example: I have the file named datas.xls in my Desktop (Puppet Master). How do i copy this files to all my puppet clients in the following location ( /home/operator1/Desktop/Backup/) ? (HowTos)