Comment on page
The Post Selection will act as a temporary filter to your current selection. Once you hit a post-selection, the programmer will only list the filtered fixtures based on the current selection. When clicking on "All", it will restore the full selection.
The highlight & step function can be very helpful, if you want to sequentially step through all selected fixtures. The Highlight function will temporarily "fully open" the fixture, to enable e.g. the light output, but without actually writing the values into the programmer. Using the step buttons, you can step through the selection list.