       1mlvarpush 4m22mvar24m 4mstring24m ?4mindexExpr24m?
              The  1mlvarpush  22mcommand  pushes (inserts) 4mstring24m as an element in
              the list contained in the variable 4mvar24m.  The element is inserted
              before position 4mindexExpr24m in the list. If 4mindex24m is omitted, then
              0 is assumed.  If 4mvar24m does not exists, it is created.

              If the expression 4mindexExpr24m starts with the string 1mend22m, then 1mend0m
              is  replaced with the index of the last element in the list.  If
              the expression starts with 1mlen22m, then 1mlen 22mis  replaced  with  the
              length  of  the  list.  Note the a value of 1mend 22mmeans insert the
              string before the last element.
