In making up lab assignments, we often set up our own calculators so that you can't do certain things; we make it impossible to see some of the commands, to display some calculated values, and to add or remove communication arrows to certain rows. Such calculators are locked. You can reset these calculators only by using the button at the top of the window labeled "Reset all locked" or the button labeled "Reset All". You can similarly start or stop all the locked calculators using the appropriately labeled buttons. The difference between "Reset All" and "Reset All Locked" is that the former resets every calculator in the workspace (and some other gadgets as well) whereas the latter resets only the locked calculator.