The HIGHLIGHT clause causes the screen item to appear in high intensity mode
when it appears on the screen.
General Format
Syntax Rules
This clause is valid for input, output, update and literal fields.
If the HIGHLIGHT clause is specified at group level, it applies to all suitable
subordinate elementary items.
General Rules
If the FOREGROUND-COLOR clause is also specified, the HIGHLIGHT clause causes
the foreground colors to become brighter and lighter; for example on some
hardware, black can become grey and brown can become yellow. However, this
does not apply to the BLANK SCREEN clause.