Highlt (Highlight) key
The Highlt (highlight) key is used to toggle the highlight mode.
When highlight is on, then all your selected fixtures will usually output a dimmer value of 100% and most fixtures will turn open white without any gobos. The Highlight values are defined by the fixture profile and cannot be changed in the console. They will stay like this as long as they are selected and highlight is on. You don't need to gives your fixtures any value in the programmer. Highlight will temporary overwrite the outputting values, but not put the dimmer, color and gobo in your programmer.
If you press and hold the Highlt key then your selected fixture will begin to flash as long as you keep the key pressed.
This is a great feature if you try to locate a fixture in your rig.