I saw there was a discussion about the missing light bulb in the later versions of Mathcad, but I haven't seen the following suggestion.
I would like Prime to have an indicator on the Windows task bar. You know, the bar that shows the applications open. If the symbol for Prime/Mathcad had some way of indicating that a worksheet was computing, then I could work on other programs and see when the calculation stops just by looking down at the task bar. This would eliminate the need to flip back and forth between the Prime window and the other application's window.
My Spideroak clould backup program has a small icon that changes colors in a cyclic manner as the program is downloading or uploading. But even just a static change in color of all or part of the icon would work.
If this feature is already available in Prime, let me know and I will remove this discussion.