Key Control refers to various methods for making sure that certain keys are only used by authorized people.

The 1st officer nodded to his commander and reached for certain keys on his panel.

The technical person would hold down a certain key while powering up the device.

The user runs Memtest86 by pressing a certain key during boot-up.

Pressing and holding certain keys will reveal similar characters.

If the latter accepts the collect call by pressing a certain key, the two parties are connected.

Furthermore, the staff notation requires that the song be played in a certain key.

Similarly, some instruments may be said to be built in a certain key.

There are certain keys to the recognition of souls that the music relates to.

I fall back on certain keys, trying to get in a pattern.