Answer:
Your computer\'s version of white-out.
I have joy in bringing two together, but darning my existence! My life hangs by a thread, filled with ups, downs and resistance!
With sharp edged wit and pointed poise. It can settle disputes without making a noise.
They are two brothers. However much they run, they do not reach each other.
What begins to die on a wedding day?
It flows out of the soil, It burns you if it boils, And holds us in its coils, More valuable than gold, As black as it is old.