cconcat ?string1? ?string2? ?...?
          Concatenate  the  arguments,  returning  the  resulting
          string.   While  string  concatenation is normally per-
          formed by the parser, it is occasionally useful to have
          a command that returns a string.  The is generally use-
          ful when a command to evaluate is required.  No separa-
          tors are inserted between the strings.

          This command is UTF-aware.

          This command is provided by Extended Tcl.