im using the 13macbook. 1. im wondering why my display screen is shifting to a larger view when i connect to an lcd projector during presentations. how can i prevent this from happening? 2. is the usual command delete option sufficient to erase applications? 3. how can i optmize my memory, job similar to "defrag" of windows? 4. any site where i can learn tips on how to maximize my mac? tnx po.