Yes. When you have more than one person working on a workbook, you can have
more than one person change the same cell(s). Someone is normally in charge
of a workbook and supervises the changes made to it. With Tools/Track
Changes, you can see who changed what and accept or reject any changes. I
change cell A6 to "Bill". Someone else changes A6 to "Charlie". And yet
someone else changes A6 to "Anita". Who makes the decision what should be in
A6? The person in charge of the workbook, usually the owner, using
Tools/Track Changes to see who made the changes to A6 makes the decision as
to what A6 should be.You can also distribute the workbook to multiple users
and then merge the distributed workbooks later, and someone has to make
decisions regarding conflicts - if two or more people change the same
thing(s), whose changes take priority? I strongly suggest you read up on
this. It is called workbook collaboration.