Tabbed Shelf : special Tabbed shelf

Hi,

I understand  how to use the little text icon with searching result : 
with DND, I get a Lifesearch file (*.lsf) saved in the folder where I 
did the drag action.
But, with the same icon on the tab of the special tabbed shelf, I 
can't do anything : what does mean this little text icon on this tab ?

Maybe, some help exists about this, but I don't find it after so much 
"googling".
The HelpViewer.app seems good, but it is empty.
Maybe I could help on writing such a help if it does'nt exist yet ?

Patrick Cardona.