Here, we describe the set of FDBG services and commands necessary to do a
simple debugging session. No major modification of your CLP(FD) program
is necessary to use FDBG this way. Debugging more complicated programs,
on the other hand, might also require user written extensions to FDBG,
since the wallpaper trace produced by the built-in visualizer
fdbg_show could be too detailed and therefore hard to analyze.
See FDBG Advanced Usage.