## 16.3. Internal Names

The Solaris man macros use a number of macro, string, and number register names that begin with `]`, `}`, and `)`. Such names should be avoided in your own files.

The number registers `D`, `IN`, `LL`, `P`, `X`, `d`, `m`, and `x` are used internally by the Solaris man macros. Using `.nr D 1` before calling the `.TH` macro generates pages with different even and odd footers.[18]

> [18]This information was gleaned by examining the actual macros. It is not documented, so Your Mileage May Vary.

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