The most visible document in manufacturing is the work order. Which piece, at which size, through which processes and when it will be ready. When that information is printed on paper nothing seems wrong; the trouble starts when something changes. The customer corrects a size, a line is cancelled, a piece breaks. The paper knows none of it.
That is where a glass manufacturing system differs. The work order is not a document but the current state of the record. The moment a change enters the record the order changes with it; the paper going to the bench is reprinted and the old one becomes void. Nobody has to ask which paper is current, because there is a single source of truth.
The process route sits on the piece as well. If a piece goes from cutting to edging and then to the tempering furnace, that sequence is written in the record and advances as it is scanned at each station. Because the route is written on the piece, different lines of the same order can take different paths, which is what happens in a real workshop anyway.
Multi layer work shows best why this structure is needed. What is meant by production tracking for insulated or triple glazed units is that the order is split into its component panes and each component follows its own route. When one of two components breaks the product is not ready, and only a record kept at piece level can say so. The same holds for laminated glass.
Remakes come out of this structure too. A broken piece enters the record and a replacement is opened; the new piece follows its route from the start. On a paper based arrangement this is tracked by hand and usually noticed on dispatch day.
Keeping the route in the record makes planning easier too. How many pieces are waiting in front of a process can be counted; how full the tempering furnace is that day is read rather than guessed. That information is not gathered separately, it forms as a by product of the scans, and that is exactly why it stays correct on busy days as well.
You do not need to set up every station to begin. Scanning at a single stage is already enough to close the question of where something is right now. Each station added later sharpens the picture a little more. What the software does here is not to manage manufacturing; it collects the information manufacturing already produces and keeps it from getting lost.