CrunchBang Linux

Hey,
Here is what I'm wondering. Must be easy, and missing something. When I add the "Application Launch Bar" (in itself not necessary) to the lxpanel,  its configuration settings window displays a whole list of all the programs I have in my system in the "classical" human readable categories of Graphics, Internet, Tools, etc.
(Discovered it by just browsing around, and this way discovered I had some applicatios I did not know I had or didnt know what they were for. So I started checking them one by one... which is reduntant... and I will forget their purpose and names, again, too.)

Normally I use dmenu as the launcher and most happy with that. But... still...sometimes one forgets... and the OB menu does not reflect all of these apps. So:

a) How to automatically update the OB menu to reflect a similar  full hierarchy (Like the one in gnome or the one reflected by lxpanels)?
b) How to invoke such list to choose applications to launch or at least just see them? Is the applications list actually a separate app with a tricky name so one could just invoke it as a separate app to investigate one's installed apps in a meaningful way? (Just looking into /usr/bin is not the answer, as it wont tell us, for example, that synapse, which I had forgotten I had, was a program related to internet/communication)