}

  #
  # NOTE: This procedure returns the base URI for the package repository
  #       server.  There are no arguments.
  #
  proc getLookupBaseUri {} {
    global env

    set varName [appendArgs [getLookupVarNamePrefix] base_uri]

    if {[info exists $varName]} then {
      return [set $varName]
    }

    global env
    set varName [string trim $varName :]

    if {[info exists env($varName)]} then {
      return $env($varName)
    }

    return https://urn.to/r/pkg; # NOTE: System default.

  #       script file, if it exists.  Any script errors raised are not
  #       masked.  The script argument must be the fully qualified path
  #       and file name for the primary package repository client script
  #       file.
  #
  # <public>
  proc maybeReadSettingsFile { script } {
    global env
    global tcl_platform

    if {[string length $script] == 0 || \
        ![file exists $script] || ![file isfile $script]} then {
      return
    }

    set scriptName [string toupper [file rootname [file tail $script]]]

    if {[info exists [appendArgs env(NO_SETTINGS_ $scriptName )]]} then {
      return
    }

    set prefixes [list]

    if {[info exists tcl_platform(user)]} then {
      lappend prefixes $tcl_platform(user)
    }