No
No the laptop can not connect with the PS3 through the internet.
you need something in which the cable at the back of your console can use to connect to your screen
No, you cannot play PC games on the Nintendo Wii. Only Nintendo Wii games can be played on the Wii console and PC games are only designed for use on a PC or laptop.
nope
install the webcam and place it on top of the monitor
You "simply" need a TV-in adapter... and as you noticed there are not so many laptops with TV-in. Therefore, I recommend byuing an external TV-in adapter - it cost about 60$.
You can use screen recording software like Jing, Jing is free and very easy to use.
Yes, Samsung make plasma flat screen monitors one can use with a PC or games console. One can also use any modern plasma TV as a monitor if they want to.
Change the brightness of the screen sometimes works.
To print the screen on your Dell laptop without going to the clipboard just use the Snipping tool.
No
Just use one those laptop screen cleaners...