>   - How can I find out which is the currently selected item that a user
>  selected in a listview.

Following is the code I use to find which list item has been clicked on. If anyone knows anything better, I'd love to here.

; structure for each item on list
NEWTYPE .user
  num.w         ; important. must be word and must be first ( don't
                ; remember why though :-( )
  name$
End NEWTYPE

Dim List users.user(10)

; set the num value for each item to a value corrosponding to their
; position in the list view. i.e. 0 for first item, 1 for second, etc
; these values must be recalculated if the list changes
ResetList users()
count.b=0
While AddItem( users() )
  users()\num=count
  Let count + 1
Wend

ev.l=WaitEvent
Select ev
  Case $40
    Select GadgetHit
      Case #LIST_BOX_ID     ; if our list box is clicked on
        ResetList users()
        found.b=False
        Repeat
          If NextItem(users())
            If users()\num=EventCode    ; search through \num's until
              found=True                ; item selected is found
            EndIf
          EndIf
  ; here, users() now points to the selected list item
        Until found=True
    End Select
End Select
; EventCode is the number of the item clicked on. So if EventCode was 5,
; the 5th item from the top was clicked on.