...tree.

A spanning tree is a tree which contains each node of the (connected) graph under consideration. There are many possible spanning trees for a graph.

...canvas

That is the drawing area of WebMap's window

...up

The map is scrolled automatically to always display the highlighted node.

...layouts

The current version of WebMap only supports the spanning tree layout including non-tree edges and does not yet support tree condensing.

...CORBA

Common Object Request Broker Architecture

...send

This command uses the property concept of the X-server to implement a kind of remote procedure call between Tk programs whose windows are displayed by the same X-server.

...agents

In this context agents are objects which are `wandering' through communication channels and then are executed at their destination.

Peter Dömel (doemel@informatik.uni-frankfurt.de)