When a field is on the screen, you can change it with a
command almost identical in format to SFE, called modify field (MF).
The only differences from SFE are:
The field must exist.
The command code is X'2C' instead of X'29'.
You send only the attributes you want to change from their current
values, and you send display data only if you want to change it.
A null value sets an attribute back to its default for your particular
terminal (you accomplish the same thing in an SFE order by omitting
the attribute).
For example, to change the “menu” field of earlier examples
back to the default color for the terminal and underscore it, you
would need the sequence in Figure 1.
Figure 1. Changing field attributes within an MF order
