The expressPCB program can highlight net connections. If I click on a pad, it shows me all the other pads that it should be connected to. It does this by reading the schematic.
That's good, but I think it could do other helpful things. It seems to me the program should be able to tell which pads are connected by traces and which are not.
That being the case, it should be able to tell me if all the pads that should be connected are connected.
It should also be able to tell me if pads that should not be connected are connected.
Does this make sense?