'PW:' identifies the record needing correction. This record identifier appears as, for instance, PW115797 in the last line of a headword. Note that there may be multiple records for a given headword.
'Trans:' the transliteration scheme that you are using in this message to represent devanagari. For example, HK.
'old:' is the erroneous text fragment. You can copy and paste. Use the browser forward and back arrows to navigate between this form and the page with the error; or have this form and the display page present in separate browser tabs or windows.
'new:' is the correction to the old text.
'com:' indicates nature of error (e.g., 'spelling error')

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