yes you can
It hooks up to the port that looks like an oversize telephone jack
yes
Hook up a USB cable from the system to your hard drive or laptop.
probably a vga
Yes, hook it up just like a desktop.
A to B USB Cable
you need a wireless VGA cable
If you connect your modem to the router, and then using one of LAN port (router's) connect the PS3 to the router, you will not interfere with wireless signal at all.
you will most likely need a 1/8" to and XLR cable
Your best shot is probably with either a usb 2 usb cable or 'crossover' ethernet cable.
no
You will need an HDMI cable to connect your flatscreen tv to your HP Laptop. Make sure your HP Laptop has an HDMI input as well.
Sorry you can not. The laptops internal modem is mostly a PSTN device. This means it can only be used by phone lines. ADSL and Cable modems work in a different way. If you want to connect a laptop and a PS3 to the Internet a Linksys Router with multiple LAN connections must be used. The setup is then: INTERNET | CABLE/DSL Modem | Linksys router | | LAPTOP PS3