The default Fluxbox startup file at ~/.fluxbox/startup is run by
startfluxbox and has embedded comments describing how to add applications
("apps") to run before Fluxbox starts up. The startup file can be fixed to
also run apps after Fluxbox starts or after Fluxbox finishes. You might run
apps after Fluxbox startup to be sure that Fluxbox applies its window
position/decoration settings or puts the programs in the slit. Running apps
after Fluxbox finishes is useful to cleanup things that were started earlier.
The example startup file given below covers both situations.