(By Mayur Pahilajani - iStockAnalyst Writer)New York, NY - Technology stocks have remained market's sore spots, following the financial shares. But today some of them have been swinging upwards. So there is always a right time to invest in technology stocks because all tech stocks are not created equal and they tend to have more volatility than the broader market. But stay defensive in your stock selection.

The technology stocks to look out for on Tuesday are:

The world's largest computer market, Hewlett-Packard Co. (NYSE:HPQ), received an Upgrade on its shares to "Outperform" or "Buy" from Sanford C. Bernstein & Co., LLC. The firm recommended HPQ up from "Market Perform" after HP announced $13.9 billion in acquisition of Electronic Data Systems Corporation (EDS). Bernstein Research analyst Toni Sacconaghi said in a note to its clients that he has increased its price target on the high-tech giant to $55 a share, from $51 a share. He added that HP’s recent acquisition of EDS will be "materially accretive" to its future profits.

Sacconaghi also increased his per-share-price estimate to $4.23 from $4.03 for the October 2009 fiscal year, and $4.74 in 2010. Overall, Sacconaghi wrote the company offers "a compelling combination of stability, an attractive valuation and a high likelihood of upward revisions going forward." However, he suggested to its clients to remain cautious on the global IT front as the spending as slowed down. Shares of the company were trading up by 2.38 percent or $1.09 to $46.83 at 11:37 a.m. ET in New York composite trading. The stocks had closed at $45.74 on Monday on the New York Stock Exchange.

Google Inc. (NYSE:GOOG) has emerged yet another strong player in the technology market as it remained in the news for mostly good reasons. Early morning today, Google announced that it will diversify its advertising scope beyond Internet and is preparing to enter new markets including television for additional revenue growth. Its first television advertising will be for cable networks owned by General Electric Co.'s NBC Universal. In the last quarter, the company reported that 97 percent of total $5.37 billion revenue generated came from online advertising.

In a separate news, Google said it will build a satellite network to provide Internet connections in emerging markets in conjunction with Liberty Global Inc. and HSBC Holdings PLC. O3b Networks Ltd. will be operational by late in 2010.