Since more than one person can use an Plus company file, you might run into situations where two or more people are making entries at the same time. There also are times when important maintenance procedures affect your entire company file, such as when you back up a company file. In each case, MYOB software uses file locking to protect your accounting data. File locking can take two forms: multi-user file locking and single-user file locking. This section will help you learn more about the two types of file locking.