The MOO programming language is described in excruciating detail in the LambdaMOO Programmer's Manual, available for FTP from ftp.lambda.moo.mud.org in the file pub/MOO/ProgrammersManual.txt, and on the Worldwide Web at ftp://ftp.lambda.moo.mud.org/pub/MOO/html/ProgrammersManual_toc.html. The online help consists of a few quick reference guides here in the help system under the following topics:
statements -- the syntax and semantics of the various kinds of MOO statements expressions -- the same for the various kinds of MOO expressions functions -- a list of the primitive functions available to MOO programs