Final answer:
To locate a tab character in a document, the Find and Replace dialogue box should be used, where you can press the Tab key or enter a special character code.
Step-by-step explanation:
To locate a tab character in a document, you should use the Find and Replace dialogue box. This feature is found in most word processing software and allows you to search for specific characters, including tabs. To use the Find and Replace feature, generally, you will go to the 'Edit' menu and select 'Find' or 'Replace', or you can use a shortcut, often Ctrl+F or Cmd+F on a Mac. Once the dialogue box is open, you can enter the tab character by pressing the Tab key in the 'Find' field, or by using the special character code for a tab, which is typically ^t in Microsoft Word.