Opus provides basically two ways of getting direct input from the user, 
each has two variations: 
 
 dopus request  
 
  This presents the user with a window with some text and a choice of one or 
more buttons to select.  These are similar to the normal System requesters. 
Requesters will appear in the centre of the Opus screen. 
 
 dopus getstring  
 
  This displays a string gadget in which the user can type some text and also 
have a choice of one or more buttons.  The string gadget will appear in the 
centre of the Opus screen. 
 
  The two commands below provide the same functions as the two above except 
that the requester/string gadget will appear centred over the nominated 
lister. 
  The two main advantages of this is that: 
 
 - it provides an immediate indication of which lister the input is going to 
   be used for. 
 - you don't need to keep moving the mouse to the centre of the screen if you 
   are using the lister that's running the script. 
 
  The disadvantage is, of course, you need a lister open :) 
 
 lister request  
 lister getstring