proc ?lappend {v_name args} {
  upvar $v_name v
  if {![info exists v]} {
   return -code error "expected $v_name to exist!"
  }
  foreach val $args {
   lappend v $val
  }
 }

[MG] - How does this differ from ''lappend''? Unless I'm missing something (quite possible;) it seems to work exactly the same. . .
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See also [?set],[?append]
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[Category Command]