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As a rule, you can connect an open or encrypted WiFi network to your Apple device without any problems. Info: the wireless network is then an IEEE 802.11 network.
Open the system settings on your Mac. Then under "iCloud", select "Update account" and then enter it in "Security".
There are several ways to use Windows on a MacBook: "Bootcamp" is an Apple solution to install Windows on its own partition (a section of the hard drive) of your MacBook. Another option is "Parallels Desktop". This program creates a virtual Windows machine on Mac OSX. "VMware Fusion" is quite similar.