HEIDENHAIN TNC 426 PB/M Technical Manual page 861

Soft keys in the table function (second soft-key row):
Soft key Function
Show list of bytes.
Show list of words.
Show list of double words.
Show contents of operands in hexadecimal or decimal.
List of strings (only the first 70 characters). Overwriting is not
possible.
Save states of selectable operand areas in an ASCII file.
Areas of more than one operand can be saved, e.g. M0 to
M100, W100 to W118
Display saved ASCII file with states of operands.
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7 – 12 HEIDENHAIN Technical Manual TNC 426, TNC 430