How to write a self-insert-command-like command?

[Marcin Borkowski]

Hi all,

I want to have a command whose behavior will depend on the key used to
invoke it, much like self-insert-command.  How to do that?  Is
last-command-event the right tool for that, or is there a better one?

TIA,

-- 
Marcin Borkowski
http://octd.wmi.amu.edu.pl/en/Marcin_Borkowski
Faculty of Mathematics and Computer Science
Adam Mickiewicz University