Network Shared Workbook with Multiple Users

[Jeff]

I have a workbook at my job the i that everyone has access
to. They all need to enter information at the same time.
If i have numbered rows and i enter something into row 1
and someone else is accessing the file at the same time
and they are also entering something into the same row,
will the workbook, on its own organize the info or do i
have to set up some rules so that information on that
workbook can be entered all day by multiple users without
conflicts.???

Thank you.