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$.
No
The most important accessories for the GBA include a carrying case to protect the console while not in use and a screen protector to cover the scratch prone main viewing screen.
nope
install the webcam and place it on top of the monitor
You can use screen recording software like Jing, Jing is free and very easy to use.
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.
You don't. You have to obtain and use a SNES console.
No the laptop can not connect with the PS3 through the internet.
Just use one those laptop screen cleaners...
Yes. ;) Yes. ;)
You can you use the program which is called RealVNC, UltraVNC, Remote Office manager, RAdmin.