Set Buffer Modifiable

  Determines whether you can edit (modify) the text in the buffer.

  Usage notes:

  o  By default, buffers you create are modifiable. Typically you make a
     buffer unmodifiable to prevent inadvertently changing text you want to
     keep intact, such as reference data or a previous draft.

  o  Making a buffer read-only also makes it unmodifiable.

  o  If you create a "scratchpad" or temporary storage buffer, you may want
     to set it to read-only and modifiable; this lets you edit the buffer,
     but EVE does not write out that buffer on exiting.

  o  You can also set the modification attribute by using SET BUFFER.

  o  If you use REMOVE, CUT, or BOX CUT in an unmodifiable buffer, EVE does
     a STORE TEXT or BOX COPY instead.

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  Related topics:

     Status Line     SET BUFFER     SHOW