system 

The system element instructs the AIML interpreter to pass its
	content (with any appropriate preprocessing) to the system command
	interpreter of the local machine on which the AIML interpreter is
running.

Element Information

Model

star | that | input | thatstar | topicstar | get | bot | sr | date | id | size | version | uppercase | lowercase | formal | sentence | condition | random | set | gossip | srai | person | person2 | gender | think | learn | system | javascript | ANY element from ANY namespace OTHER than 'No Namespace'
Children: bot, condition, date, formal, gender, get, gossip, id, input, javascript, learn, lowercase, person, person2, random, sentence, set, size, sr, srai, star, system, that, thatstar, think, topicstar, uppercase, version

Source 

<xs:element name="system" type="MixedTemplateContentContainer">
  <xs:annotation>
    <xs:documentation>The system element instructs the AIML interpreter to pass its content (with any appropriate preprocessing) to the system command interpreter of the local machine on which the AIML interpreter is running.</xs:documentation>
  </xs:annotation>
</xs:element>

Sample