A:AnswerThis laptop is perfect for having your online books open and using google drive to write your papers at the same time. You will also be able to research at the the same time. I have had as many as 10 windows open at a time without losing speed.
A:AnswerI have not tested a Stylus yet to work with this laptop, but I'am sure any Bamboo stylus will work. As for replacing the HDD, you will need to have someone that knows what they are doing to do so as it involves taking apart half of the laptop.
A:AnswerIt will work fine for software dev. Your bottleneck for performance will be the physical hard drive, look into getting an SSD if possible.
The objective-c comment makes me think you are interested in developing for Apple products. Just be aware that software dev for Apple products requires OSX and XCode.
A:AnswerWe have verified this is a Kensington lock slot. Information we have is: Connects to a Kensington-compatible computer security lock. Wrap the computer security lock cable around an immovable object such as a table or handle of a locked drawer. Insert the lock into the notch and turn the key to secure the lock. Some keyless models are also available.