Taken from the user manual:
internal tags –these tags can represent formatting information,surround in-document markers and appear inside the text to be translated. Most internal tags can be move around
within the segment to suit the translation. Depening on the file format,some internal tags can be moved or deleted as required. TagEditor classifies unknown tags as internal and
surrounds all internal tags with a red border by default.
[Edited at 2005-05-18 00:56]