Blocking Info & Who

["Scharf, Sandy" <sscharf @ fsc . follett . com>]

     My company is very worried about security on our new list.  They don't 
     want people to be able to do the WHO command, even if they are 
     approved subscribers.  Is there any way to block this command or to 
     modify the instructions it sends out when you request help so that it 
     doesn't include WHO as an option?
     
     Also, they want me to modify the initial message that gets generated 
     when someone tries to subscribe.  They get a canned response and they 
     want us to customize that, I can't figure out how to do this?
     
     Any help would be GREATLY appreciated.
     
     Thanks,
     Sandy