You can use this property to make some restrictions and to combine all restrictions between them. Try to find something in J2ME website at www.java.sun.com , over there, you're gonna find many articles and short courses about the J2ME Technology.
Best wishes and good luck
Lucas Abrao
My name is Inigo Montoya, you killed my father, prepare to read a tiny ad:
a bit of art, as a gift, the permaculture playing cards