The table display acts as {HEAD ~ a window} into {TAIL ~ a database} when it is selected by a user 
into
The table display acts as { HEAD ~ a window } into { TAIL ~ a database } when it is selected by a user
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH