3:   How do I read topic XXX in the on-line manual?
  
  When I refer you to topic XXX in the on-line manual, you can read this
  manual node inside Emacs (assuming nothing is broken) by typing this:
  
    C-h i m emacs RET m XXX RET
  
  This invokes the Info facility.  If you don't already know how to use
  Info, type "?" from within Info.
  
  If I refer you to topic XXX:YYY, you need to type this:
  
    C-h i m emacs RET m XXX RET m YYY RET
  
  WARNING: Your system administrator may not have installed the Info files,
  or may have installed them properly.  In this case you should complain.