(yatexe)How the function is called

Useful functions for creating add-in

How the add-in function works

Add-in functions

How the function is called
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  YaTeX calls the add-in functions for specified begin-type, section-type,
and maketitle-type command, if any.  `Option add-in' functions for
begin-type are called when `\begin{ENV}' has been inserted, functions for
section-type are called just before input of the first argument, and
functions for maketitle-type is called after maketitle-type command has
been inserted.  `Argument add-in' functions are called at each entry of
arguments for section-type commands.