Mac laptop sleeps / WiFi turns off when lid is closed

Mac laptop sleeps when lid is closed

OS X enforces system sleep and turns off WiFi when the lid of your Mac laptop is closed *UNLESS* very specific requirements are met.

While this behavior can be overridden, OS X must be modified with a kernel extension to do so. Apps from the Mac App Store, such as Amphetamine, are not able to modify OS X using a kernel extension.

1) Use an alternative application:
2) Meet Apple's requirements for using clamshell mode:

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