That depends on the computer.
- Some have wireless (especially laptops), some don't (especially desktops).
- Some come with full Windows, other come with Window RT, Linux or Mac OS.
- Some use only the standard Windows software (the wireless zero configuration utility) others come with their manufacturers own software.
- Some have a physical 'airplane switch' (to turn it off or on), others use a program or an fn-key for that.
So the general advice to find the answer: (a) read it in the user manual, or (b) ask the shop for after-sales support
<span id="INSERTION_MARKER">How do I cannect a new computer to my wireless home network?