[erlang-questions] Change a Spec of a running supervisor

[Colin Z]

In a supervisor, I use a config variable to determine what module to use in
one of its worker specifications.

Is there a way to change a spec while an application/supervisor is already
running?

It's easy enough to change the code of an already loaded module (just
recompile), but how can I switch between using two different modules?

Specific example:
I have module for handling logins that I want my supervisor to be in charge
of. Say that I've started the application and my config variable was
"basicLoginHandler". Without bringing down the entire application, how can I
later make the supervisor terminate its "basicLoginHandler" spec and start a
new worker using a module called "advancedLoginHandler" that I've decided
should be used instead?
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