http://www.purl.org/tcl/home/man/tcl8.4/TclCmd/lrange.htm
lrange $x 0 end may be used to force a list x to have list (as opposed to string) representation - this enhances performance in some situations.
See also list, lappend, lindex, linsert, llength, lreplace, lsearch, lsort .
Tcl syntax help - Arts and crafts of Tcl-Tk programming - Category Command