How Can I install the most recent version of software and firmware updates?

From the Apple () menu, choose Software Update. Install any updates related to OS X.

How can I tell if I have the most current OS X software?

From the Apple () menu, choose Software Update. If there are no available OS X updates then you have the most current software for your version of OS X.

How can I tell if I have the most current firmware?

From the Apple () menu, choose About This Mac and click More Info. Then, click System Report.

Locate the "Boot ROM Version" field. If you see "IM141.0118.B00" on the iMac (21.5-inch, Late 2013) or "IM142.0118.B00" on the iMac (27-inch, Late 2013) you are up to date.

If you do not see these version numbers, you should run Software Update and follow the on screen instructions until there are no more available updates listed for your computer.