NOTE: Tags do not apply to Template expressions, instead you use Template Parameters.
Search Keys are custom database fields that are used to contain strings of characters or numbers. They are used to provide an alternative method of identifying items in the database—items can be identified by a search key value rather than the name of the item. For example, a search key can be created to contain the unique code number of each outstation. If the search key is configured to be a tag, every outstation in the database that has an entry in the search key field can then be referenced by its unique code number. So rather than having to reference an outstation by name in an expression, you can reference it by its code number entry for the search key.
To use the browse button to insert a search key tag, see Selecting a Search Key Tag.
To enter a search key tag manually, see Syntax of Search Key Tags.