The PS3 will not be able to play the PS4. They both are on the Playstation Network (PSN) and Playstation Plus will work for both of them as it does for the PS Vita and PS3
A person will not be able to hack the PS4 and then be able to play online for free. The games will need to be purchased as will the PlaystationPlus, which allows people to play online.
You don't have to pay for online gaming, unlike the PS4 - you don't need PS+ to be able to play it online.
connect your ps4 to your pc or monitor
It costs $49.99 in a year to play Sony's PS4 online.
no
Yes, one must have a PlayStation card to play the PS4 online.
You can connect a wi-fi adapter to a ps4 using Linksys PS4 Wireless-AC universal media connector.
No they have a different plug in to charge therefor the ps3 controller won't connect to the ps4
Yes of course
Not online
You can go to the PlayStation store and download the PS4 version on your PS4
To connect a PS4 to a Dell Inspiron 2305 all-in-one PC, you can use a capture card that allows HDMI input, as the PC does not have HDMI input capabilities. Connect the PS4 to the capture card via HDMI, then connect the capture card to the PC using USB. Install any necessary software that comes with the capture card to display the PS4's output on your PC screen. Alternatively, you can use Remote Play to stream the PS4 to your PC over the internet if a direct connection is not feasible.