I really wish Sony would release official support for it like they said they would, but at this point I guess they lied. You'll find the gear icon to launch the client in your Start Menu. The light on the back of your controller should illuminate when it's on.Step 3, Open the Steam client. You'll find a USB port on the front of your computer's tower, on the back of an all-in-one, or along the sides of a laptop you'll find the mini-USB port on the back of the controller.Step 2, Press the PS button on the controller to turn it on. If this doesn't work, then you can always install the PS4 System Software 7.50 update via USB drive, with the following steps from Sony: Using a PC or Mac, create a folder on the FAT32 USB named 'PS4'. Select option 3: 'Update System Software' and then 'Update using Internet'. This means that older games, that use DirectInput, may not work perfectly with the Xbox 360 controller.
For the Xbox 360 controller, Microsoft introduced a new API for DirectX called XInput, which is used for Xbox 360 compatible periphials.