The Command Window can be used to develop and execute SQL scripts, using the familiar SQL*PLus command syntax. The built-in editor is a comfortable environment to develop your scripts, using SQL*Plus, SQL and PL/SQL syntax highlighting. It has the same powerful features as the PL/SQL Editor, such as the Code Assistant, the Object Popup Menu, and so on. You can quickly switch between the script editor and the command line by clicking on the tabs at the top of the window.
Just like with SQL*Plus you can interactively type single commands and SQL statements on the command line. Error messages are displayed in red, and the error location is underlined in red as well. This makes it easy to find and identify errors.