The format of the .DEFINE verb follows. Also, the default control
characters are specified if you do not want to define your own.

>>-.DEFINE--char--+--------------------------------+-----------><
+-| options |--------------------+
+---VAriable--+--------------+---+
| +-stem.--------+ |
| | .----------. | |
| | V | | |
| '---variable-+-' |
'-DROP---------------------------'
options
.-UNProtect-. .-NORmal----.
|--+-----------+--+-----------+--+-DEfcolor--+--+-BLInk-----+--->
+-PRotect---+ +-BRight----+ +-GReen-----+ +-REVerse---+
'-SKip------' '-INVisible-' +-RED-------+ '-UNDerline-'
+-BLUe------+
+-TUrquoise-+
+-WHite-----+
+-YEllow----+
'-PInk------'
.-NOJustify-. .-NULls--.
>--+-----------+--PAd--(--+--------+--)--NUMeric--CUrsor--MDT---|
+-LEft------+ +-BLAnks-+
'-RIght-----' '-char---'