When I send and update request to more than 1 person - I understand I can add an Action to lock the row such that subsequent updates fails.

1) Is it possible to capture who updated - into a cell ? Writing a comment shows who updated - so I assume somewhere this information is collected.

2) Would subsequent updates be possible on the UI or would it fail when the form is loaded? Would the user be informed of update failure ?

ps: newbie reviewing smartsheet.