Resident set is that portion of the process image that is actually in real-memory at a particular instant. Working set is that subset of resident set that is actually needed for execution. (Relate this to the variable-window size method for swapping techniques.)

It is a useful system for small and home-based businesses. It captures information at the time the transaction takes place. These One-Write Systems are efficient because they eliminate the need for recopying the data and are compatible with electronic data processing if you should decide to computerize. Many small businesses rely totally on the One-Write System for simplicity and versatility. With only two pieces of paper, a check and a ledger, you get all the benefits of sound bookkeeping: accuracy, money distribution, check control, audit trail, running bank balance, and instant review.

Phishing is an attempt to illegally gain access of the sensitive informations like Username & passwords.
Basically its done thru email & Instant messenging.

ex:- Targeting the bank sites ,Ebay

Train frontliners to connect with customers by knowing their names, preferences and what they might like in the future. Don't think of them as potential customers but as individuals. Building a relationship with customers leads to brand loyalty.

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Actually companies do use Instant messangers for their employees to communicate with each other..
work related should not be problem. But they should not be used for personal  chatting during
office hrs since that may be against the company policy.