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Select Edit»VI Revision History to display this window. You also can select File»VI Properties, select General from the Category pull-down menu, and click the Revision History button to display this window.

Use this window to view the history and document changes of the current VI. To include an entry in the revision history each time you save the VI, even if you do not enter a comment, select History in the History window and make sure there is a checkmark next to Show Empty Entries.

Note  The History window is available only in the LabVIEW Full and Professional Development Systems.

This window includes the following components:

• User—Displays the name to include in new history entries. Select Tools»User Name to change the user name.
• Next Revision—Displays the revision number to include in new history entries. LabVIEW increments the number every time you save the VI.
• Comment—Displays a comment you enter to describe the changes you made to the VI. Click the Add button to add the comment to the history.
• Reset—Erases the history. LabVIEW prompts you for whether you want to reset the revision number. You also can use the Clear History method to clear the revision history of a VI programmatically.
• Add—Adds a comment from the Comment field to the history.
• History—Displays the history of the VI. Enter text in the Comment field and click the Add button to add a comment to the history.

You also can use the History: Always Add Comments At Save property, the History:Prompt for Comments At Save property, or the History:Prompt for Comments At Close property to add a comment to the VI revision history programmatically.