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If you look for an information about very old versions of CKEditor, FCKeditor and CKFinder check also the CKEditor forum, which was closed in 2015. If not, please head to StackOverflow for support.
The TabSpaces function determines how many "spaces" will the cursor move or strictly speaking how many " " will appear in the HTML when pressing "TAB" on your keyboard. By default it is set to "0" so no action is taken when pressing the "TAB" button.
Example:
FCKConfig.TabSpaces = 5 ;