Then as portfolio managers sold stocks to lock in gains during the last week of that March, the QQQ, which is the ticker symbol the ETF that consists of all of the stocks in the Nasdaq-100 Index, dropped 15 percent in just one week.

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Vendors with app managers include Net Nanny, App Lock, and Smart AppLock.

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Most of these are actively managed funds where managers attempt to outperform a benchmark by selling winners to lock in gains.

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In this decade, private-equity fund managers have gathered billions even though investors who back such funds have to lock their capital away for up to ten years.

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And apart from being able to lock printers to accept e-mails only from registered e-mail addresses, there is little control for IT managers.

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