# Renaming a global variable

1. Start editing the real-time application.
2. In the menu bar, click Global variables.
3. Double-click the Name text box of the global variable you want to rename.
4. Rename the global variable uniquely.

5. Identifiers are case insensitive and must begin with a letter or underscore character. Multiple consecutive underscores or trailing underscores are not allowed.

6. Press Enter.

1. The name of the variable is changed. All usages of the variable in Program Organisation Units are automatically updated to the new name.