OpenSim grids can run the standard LSL commands. On top of that, they also have additional functionality through the OpenSimulator Scripting Language (OSSL). For example, OpenSim-specific commands can force teleports, which is useful for building walk-through teleport gates or weapons that immediately send someone to a virtual hell when they’re hit. There is also a number of commands for creating and managing non-player characters (NPCs) and to put text and graphics on a prim.

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The Windows based software can be downloaded at the Source Forge page and the manual is available from this Google Doc page.