Syntax
$head heading$$ subhead subheading$$  See Also getting started , Description A new paragraph is started and it is given the heading specified by heading or subheading . There can be no $ or # characters in either heading or subheading . In addition, leading and trailing white space in both heading and subheading is ignored.

You can specify a particular heading , using the xref command with the specified heading . You can specify a particular subheading , using the xref command with the previous heading and subheading .
The aindex command can connect the head command to the mindex command. (To make this connection, it must appear before the head command.) If this is the case, each head command automatically generates a request of the form       $mindex heading$$ In this case, occurrences of the escape character in heading has the special meaning defined for the mindex command. These characters do not appear in the displayed output nor is it part of the corresponding cross reference link text.  A similar effect can be obtained using the aindex command to connect the subhead command to the mindex command. Example Heading The input  head Topic$$  will result in the heading below: Topic This heading is the result of the example above. Example Subheading The input $subhead Topic  will result in the subheading below: