       1mlvarcat 4m22mvar24m 4mstring24m 4m?string...24m?
              This  command treats each 4mstring24m argument as a list and concate-
              nates them to the end of the contents of 4mvar24m, forming a a single
              list.  The list is stored back into 4mvar24m and also returned as the
              result.  if 4mvar24m does not exist, it is created.
