There isn't really any, it's a client side mod only.
I also have the problem where I have:
Sting name = mc.thePlayer.getCommandSenderName();
which works, I know it does, and then:
fr.drawString(name, xPos + 1, yPos, 16777215);
draws absolutely nothing. If I add quotes to it
fr.drawString("" + lowPots + "", xPos + 1, yPos, 16777215);
it draws "null" on the screen. there is no synchronization issue