refeshing view that will prevent users from editing the same node at once

I have a view with a table list of nodes. there is a field with a link to edit the node. I'd like to prevent two users that are viewing the table view to edit the same node at the same time. I know drupal will prevent the one of them from submitting the node after editing but that's not what i'm looking for. I'd like for the table view list to be updated once and to disable the edit link once a user is editing the page.

there two main things that I need to address - have a view refresh via ajax periodicly - to check the status of the nodes. - is the a module that allows a view to refresh ?
the 2nd thing is to actually check if a node is being edited, is there a flag for this?

I'd appreciate any assistance, i'm a very novice coder...

Idan