I would like to check if all the keys and LEDs on a keyboard are functioning correctly. e.g. Check if a key does not respond (or responds late) to a keypress, activates even when it isn't pressed, does not respond to multiple keys pressed at the same time, among other possible keyboard issues not readily apparent.
I would like to get an indication that can show when the keyboard registers a pressed key, to make it easier to troubleshoot faulty keys. This shareware program does that, but it's a 30-day trial only and I prefer a freeware alternative or one that doesn't have a similar functionality limitation.
The OS I am using is Windows 7.