define macro in xcode

ex:

configuration: Debug

gcc 4.0 processing-> preprocessor macros:   _DEBUG

combine c and c++ for apple driver

set build option:

gcc 4.0 language -->  compile source as -->  c++

info.plist for driver

IOMatchCategory:

set IODefaultMatchCategory to compare with other driver

the driver with higher probe score will win

IOLog

print message in the kernel

the message is stored at /var/log/system.log

hotspot shield

the software to watch american tv program (hide your real ip)

http://www.anchorfree.com/downloads/hotspot-shield/

connect to Hulu : have many tv programs
http://www.hulu.com/

java preference

show java information 

Beginning iPhone Development: Exploring the iPhone SDK