(MENU[2] == "CheckConfig") {
    Document = "<TABLE BORDER=1 CELLPADDING=5>"
    for (i in config)
      Document = Document "<TR><TD>" i "</TD>" \
        "<TD>" config[i] "</TD></TR>"
    Document = Document "</TABLE>"
  } else if (MENU[2] == "ChangeConfig") {
    if ("Param" in GETARG) {            # any parameter to set?
      if (GETARG["Param"] in config) {  # is  parameter valid?
        config[GETARG["Param"]] = GETARG["Value"]
        Document = (GETARG["Param"] " = " GETARG["Value"] ".")
      } else {
        Document = "Parameter <b>" GETARG["Param"] "</b> is invalid."
      }
    } else {
      Document = "<FORM method=GET><h4>Change one parameter</h4>\
        <TABLE BORDER CELLPADDING=5>\
        <TR><TD>Parameter</TD><TD>Value</TD></TR>\
        <TR><TD><input type=text name=Param value=\"\" size=20></TD>\
            <TD><input type=text name=Value value=\"\" size=40></TD>\
        </TR></TABLE><input type=submit value=\"Set\"></FORM>"
    }
  } else if (MENU[2] == "SaveConfig") {
    for (i in config)
      printf("%s %s\n", i, config[i]) > ConfigFile
    close(ConfigFile)
    Document = "Configuration has been saved."
  }
}