If you are talking hardware, then I guess it depends on the type of platform and application server that you are running, as well as the type of applicaton and the number of users it has to support. If you mean for for personal use only, then the lowest spec'd machine I've used is with JBOSS installed on a 192MB 650 Mhz laptop with a 10GB disk drive running NT Workstation.
Cheers
Martyn
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