DISPLAYFILE : MEXPR

DISPLAYFILE is a top-level command.
Open a (big) window in which the contents of the given file will be displayed.
Once the end of the file is reached, a message will be printed and
some additional blank lines will be added. Once the end of the
blank lines is reached, the window will vanish.
The command format for DISPLAYFILE is:

 <n>DISPLAYFILE  FILENAME  BIGWIN 
"FILESPEC" "YESNO"


The arguments have the following meaning:
FILENAME : File to be shown
BIGWIN : Big Window?

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