##### 29.3.1.1 Understanding how browse macros vary by file position

Default definitions of browse macros <$_prev> and <$_next>, and the meanings of the macro variables these macros employ, vary according to:

- whether the macros produce text links or buttons (see §29.3.2 Choosing buttons versus text links for a browse sequence)
- the sequential position of the HTML file in which the macros are invoked; one of:
  - a split file that is neither the first nor the last in the root map
  - the first file produced from the root map
  - the last file produced from the root map.

You can change any of the definitions by changing the macro code assigned to appropriate navigation keywords; see §29.3.4 Modifying macros <$_prev>, <$_next>, and <$_top>.

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29.3.1.2 Understanding how browse macros employ macro variables