[Samba] Add machine, user, group, etc. scripts

[Michael Barnes]

Can anyone tell me exactly how the various add machine/user/group/etc/ 
scripts work in Samba?  I know how to set them up in smb.conf.  That's 
not problem.  But how are they invoked?  Some use Samba specific 
variables like %u and %m.  How do you run a script manually to use these 
variables?

If you have an add user script and a non-user tries to log in, does it 
create an account for him?

If you have an add machine script and the user attempts to log in from a 
previously non-registered machine, does it automatically add that 
machine to the mix?

Thanks for ideas,

Michael