20.4.1.1 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 §20.4.2 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 split from its FrameMaker file
– the first file split from any but the first FrameMaker file
– the last file split from any but the last FrameMaker file
– the first file split from the first FrameMaker file
– the last file split from the last FrameMaker file.
You can change any of the definitions by changing the macro code assigned to appropriate navigation keywords; see §20.4.4 Modifying macros <$_prev>, <$_next>, and <$_top>.
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