Create a Shortcut or Hotkey to Eject the CD/DVD...

Create a Shortcut to Eject the CD/DVD Drive
Right-click on the desktop or elsewhere and choose New \ Shortcut.
In the location box, put the full path to the nircmd.exe file that you downloaded, and append the "cdrom open" command to the end of it, adjusting the drive letter to match your disc drive:
"C:\path\to\nircmd.exe" cdrom open D:
Note the location of the quotes.. if you are using a path with spaces in it, you need to make sure the quotes are only around the path to the executable, and the arguments should be placed after the quote.
Give the shortcut a meaningful name, like Eject CD or something like that, and you'll have a new icon (read below on how to use the cd-rom icon as shown)
Create a Shortcut to Close the CD/DVD Drive
You can follow the same exact instructions as above, but instead of "cdrom open" just substitute "cdrom close".
Assign a Hotkey to the Shortcut
Now that we have a shortcut, we can assign a hotkey to the shortcut by right-clicking on the icon and choosing Properties. On the Shortcut tab you'll see a place to assign the Shortcut key: