Purpose: describe what Tcl considers a list element
See also list, lappend, lindex, linsert, llength, lrange, lreplace, lsearch, lsort, concat, split, foreach, array .
caspian recommends that you also see: join, lset, SetResult (http://www.tcl.tk/man/tcl8.4/TclLib/SetResult.htm ), and SplitList (http://www.tcl.tk/man/tcl8.4/TclLib/SplitList.htm )