The Linux User Group HOWTO is intended to serve as a guide to founding, maintaining, and growing a Linux user group.
Linux is a freely-distributable implementation of Unix for personal computers, servers, and workstations. It was developed on the i386 and now supports i486, Pentium, Pentium Pro, Pentium II, Pentium III, and Pentium IV processors, as well as IA32 clones from AMD, Cyrix, VIA, IDT, Winchip, NexGen, Transmeta, VIA C3 Ezra "CentaurHauls", and others. It also supports most SPARC, DEC Alpha, PowerPC/PowerMac and G3/G4/G5, and the Motorola 68020-68040 series on Mac/Amiga/Atari ST.
It supports as well the Hitachi H8 series, Motorola Dragonball, Motorola ColdFire, Motorola QUICC, ETRAX, Intel i960, NEC V850E, MPC, MediaGX, STPC, Hitachi SH3/SH4 "SuperH", Intel ARM/StrongARM, and PRISMA embedded/microcontroller/PDA machines, as well as Cisco 2500, 3000, and 4000 series routers.
It supports MIPS, PA-RISC, AMD x86-64 "Hammer", and IA64/Itanium minicomputers. It supports IBM S/390 and Fujitsu AP1000+ mainframes.
If you want to learn more, the Linux Documentation Project is a good place to start.
For general information about computer user groups, please see the Association of PC Users Groups.