Although most information for the Index is gathered automatically, in some situations it must be done by hand.
This command applies to the next identifier that appears after the ‘@_’. The index entry for that identifier will be underlined. (By convention, this means `defined' or `declared'.)
This command is usually issued automatically. For example, the index entries for the variables ‘i’ and ‘j’ in the C statement ‘int i, j;’ will be underlined, since Fweave understands enough of the syntax to know that variables are being defined. Macro definitions (begun by ‘@D’ or ‘@M’) will also be underlined automatically.