Homebrew PCBs

How are LCDs fastened to PCBs?
They seem to be "glued" somehow to the circuit boards
with some kind of conductive adhesive on the almost
transparent edge connectors.
Can anyone tell me how I can re-mount a display back
onto a circuit board after it has come unstuck?
And what kind of adhesive is used and where can it be
obtained?

Thanks,

Harry - K5HML
San Antonio, Texas