If you use the Accounting module in MONITOR, it is easy to change accounting year and switch between different accounting environments/years. When no other procedures are open you go to File on the Window menu and select Change accounting year.... The accounting environments available in the system are: Current year, Periodic statement, Annual financial statements (AFS) and Historical.
Read more about changing accounting year in the chapter Working with Periodic Statements/Financial Statements in the Accounting module.
Under Settings | Customize... you will under the Status bar tab have the opportunity to Show current accounting period, which will then be displayed in a field in the status bar. If that setting has been activated it is also possible to change accounting year by double-clicking in the field on the status bar.