ying some useful base behaviour these base classes should guard
against additions to the base interfaces breaking existing implementations.
Every attempt will be made to supply appropriate default behaviour (usually
an empty method) to the base classes for every method added to the interfaces.

<A NAME="api"><H3>Plugin API</H3></A>

There are two main ways for a plugin to communicate with SQuirreL. These are
via the <TT>net.sourceforge.squirrel_sql.client.IApplication</TT> interface
which specifies