RPM-Update on all boxes in a LAN

Hi, after reading the last security-announcement I ask myself if there is a tool to update the new rpm automatically to all the boxes in my LAN. What I want to do is the following: I recieve the security-announcement: I decide to install or not and download the rpm. I start a script, which will install the rpm to the boxes of my choice. I don't want to login on every box, install the rpm and go to the next box. I hoped alice would do things like that, but I think alice is only a tool for new installation (and you have to make a floopy-disk or a CD). And I think, some month ago, I have read about a scripting-language for system administrators, but I don't remember where. Anybody, who can help me.