JSR-118 introduces a new mechanism in J2ME applications, called Push Registry. According to Sun’s developer website [1], Push Registry enables MIDlet to start automatically or launch itself without user initiation when a certain events have occurred. These certain events include the call of time-based alarm or an alert of an incoming network connection.

Reference:
[1] Sun Developer Network Site: J2ME technology reference. http://developers.sun.com/mobility/reference/techart/index.jsp.