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n. online acronym for 'Use the Source, Luke' (a pun on Obi-Wan Kenobi's "Use the Force, Luke!" in 'Star Wars') -- analogous to RTFM, but more polite. This is a common way of suggesting that someone would be best off reading the source code that supports whatever feature is causing confusion, rather than making yet another futile pass through the manuals or broadcasting questions that haven't attracted wizards to answer them. In theory, this is appropriately directed only at associates of some outfit with a UNIX source license; in practice, bootlegs of UNIX source code (made precisely for reference purposes) are so ubiquitous that one may utter this at almost anyone on the network without concern. In the near future (this written in 1991) source licenses may become even less important; after the recent release of the Mach 3.0 microkernal, given the continuing efforts of the GNU project, and with the 4.4BSD release on the horizon, complete free source code for UNIX-clone toolsets and kernels should soon be widely available.