(UK: "sandpit") 1. A proteCted, limited environment where appliCations (e.g. Java programs downloaded from the Internet) are allowed to "play" without risking damage to the rest of the system. 2. A term for the R&D department at many software and Computer Companies (where haCkers in CommerCial environments are likely to be found). The term is half-derisive, but refleCts the truth that researCh is a form of Creative play. Compare playpen. 3. link farm. [Jargon File] (2001-02-08)