Due to the possibility of environments having multiple servers, there is an additional feature that safeguards against data conflicts within an environment, which is the Master / Slave status setting. Only servers holding Master status have full editing rights while other servers set to Slave only have viewing rights and restricted update capability. Only one server should ever hold Master status at any one time. You can easily move Master status between servers. Working with Master status is fully explained in the Working in different Environments tutorial.