No comment regards your intelligence, I don't know you!!!!!
Having extended desktop enable you to have a program on main monitor and
another on No. 2 monitor, you do this by opening a program in main monitor
then place pointer on the top bar of application, hold down left mouse
button, then drag application onto 2nd monitor, some application need to be
reduced in screen size before you move, then once in place, maximise, Just
the reverse to bring it back to main monitor. Also some applications if you
close then when on 2nd monitor, and open again it will appear on the 2nd
screen.
If your PC is capable you can watch TV/DVD on 2nd monitor and have a word
processor on the main monitor.
Again depending on PC capabilities you can have multuple applications open
on both monitors.
Regards
Bob J
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Then we all benefit.