Library /sys$common/syshlp/acledt.hlb KPCOMMA_KEY  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    DEL C (,)

    Deletes the character on which the cursor is positioned and
    stores it in the delete character buffer.

    UND C (GOLD-comma)

    Inserts the contents of the delete character buffer directly in
    front of the cursor.