There are ways, but you need to consider carefully what simoutaneous updating you wish to do.
For example if you have a database of names and addresses and two people wish to update it at same time, then if they wish to update different records, no problem should occur. However if they try and update same record then which one is correct ?
Update the same table (adding/editing) and updating different tables in the database. They can all access the database at the same time but can not update it. I know it can be a problem with editing the same table but is it a way where if they are all adding to the database it will update?