build.prop questions

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http://androidforums.com – 1. looking through the build.prop i see this line ro.hdmi.enable=false. what does that mean? 2. can i change things in the build.prop with root explorers option? if so... 3. what would be a good setting for lcd density, wifi scan, dalvik vm heapsize? 4. another line says ro.lge.capp_optimusui=true (this one makes me scratch my head.. optimus ui?):confused: (General)