LLSD Event API Plug-in
Messages is the basic communications unit for the Second Life world. For more information, see Message. This article has been classified as a stub, you can help the Second Life Wiki by expanding this article and adding more information.
LLSD Event API Plug-in, or LEAP, is a technology present on the Second Life Viewer that allows so-called plugins to run outside the Second Life Viewer but interface with it via stdin/stdout using a well-known protocol for message passing.
For more information, read the relevant information currently available on Linden Lab's Bitbucket.