What are these imports?and how can i use them?

import javax.microedition.lcdui.Canvas;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Form;
import javax.microedition.lcdui.Graphics;
import javax.microedition.lcdui.Image;
what are these imports?

how would i make a server applet that can be accesed by 2 specific pll or random which ever makes it easier for the time being i just want 2 ppl to have acces to one applet and have a variable like a paddle in pong under each persons controll

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