The results of assigning keywords depend on whether you are assigning keywords to one document or multiple documents and if those documents already contain existing keywords. The following list describes the rules for assigning keywords: 

• Selection: One document with no keyword assigned
  Display in Toolpane: Keywords cell appears blank
  Actions Available: You can add a new keyword.
   
• Selection: One document with an existing keyword
  Display in Toolpane: Keyword appears in Keywords cell
  Actions Available: You can edit, delete, or append to existing keywords.
   
• Selection: Two or more documents that contain no existing keywords
  Display in Toolpane: Keywords cell appears blank
  Actions Available: You can add a new keyword. The keyword is assigned to all selected topics.
   
• Selection: Two or more documents that contain identical existing keywords
  Display in Toolpane: Keywords appear in Keywords cell
  Actions Available: You can edit, delete, or append to existing keywords.
   
• Selection: Two or more documents that contain different existing keywords
  Display in Toolpane: Keywords are NOT displayed. The Keywords cell appears blank
  Actions Available: You can enter a new keyword. The new keyword will overwrite any existing keywords in the selected documents. You cannot append keywords if different keywords are assigned.

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