What is L^ATEX?

L^ATEX is a TEX macropackage, that is a collection of definitions and subroutines, which modifies and expands upon the basic TEX commands by establishing a series of environments. In your input document these environments have the form

begin{environment name}

end{environment name}

operates in the picture environment. For full details about this environment, or L^ATEX in general, the L^ATEX User's Guide and Reference Manual by Leslie Lamport is most highly recommended. A basic familiarity with L^ATEX will be assumed in this manual.