User Guide

FontLab 4
202
TrueType Mapping Settings
If the Automatically Add… option is on, then FontLab will analyse the font
and add characters that are necessary for complete font compatibility. In
Windows only two characters are really necessary: the “.notdef” and
“space” characters. On the Mac a couple additional characters are required:
“CR” and “NULL”. Note that FontLab will generate these characters only if
they do not exist in the font, so you can create them manually and control
their appearance. We recommend leaving this option on, especially if you
are developing Macintosh fonts.