%RM
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This command causes all light pen sensitive fields on the screen to be made write-protected, that is, the user can select them with a light pen, but not overwrite their contents. To switch the write-protection off again, issue the command again.
For a field to be light pen sensitive, it must be displayed intensified
(session parameter AD=I) or blinking
(AD=B), and the first character in the field must be one
of the light pen designator characters ("?",
">" ,"&" or a
blank); selecting a field with a light pen causes the designator character to
be changed, therefore you can make the processing of fields selected with a
light pen dependent on the values of the designator characters.
See also
Light Pen Support (in the
Operations documentation) and the PEN value
of the system variable *PF-KEY.
