Why my macbook pro getting so hot while using two or more simple application???

Hi all,
for last 4 month i have been used macbook pro. at the begin i didn't face any trouble. recently i found that when i ran two or more application at a time my notebook began start hot. it's very scaring for me. what shall i do now.
one more thing, i need to use virtual machine here. is it create any problem for macbook pro ???

Notebook computer are designed to handle higher temps, so it's important to know the actual temps. I use the free utility Temperature Monitor:
http://bresink.com/osx/TemperatureMonitor.html
because it does not invoke DashBoard, where all the widgets running can give a higher than realistic reading.
MBPs have thermal protection; if the temps approach those which could damage the computer, it shuts off. The safety shutdown point is, depending on the MBP variant, close to 100C/212F, a level that feels realy hot to the touch.
Other things to consider:
Make sure that air can get around and under the computer. Setting the computer on your lap or a blanket can block part of the heat dissipation system.
Commercial anti-virus/internet security programs can run up the temps
Third-party backup software can also run up temps. On one of my computers, using Western Digital's backup software jumped the processor temp by over 10 percent.
Shut off DashBoard when not using it with this widget: http://www.apple.com/downloads/dashboard/status/dashquit_berenguierduncan.html
Can you elaborate of what you consider "simple Apps." A web browser is no longer simple if you are visiting sites that have a lot of Flash animation and/or video content. My MBP will jump 15-20F when viewing such sites with any browser.

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Good day to you all!
I just have an inquiry about my recently purchased Macbook Pro 15-inch (non-Retina). On the first 2 days of using it by just running Mac Mail, Safari, and iTunes, it's temperature is really acceptable. However, on the 3rd day, the base of the Macbook Pro was really hot, including the Power Adapter. I even noticed that the fan was making a loud noise, just like a jet engine (just being exaggerated). But the fan activity is really unusually loud. When it got that hot, I was doing Skype with my wife, playing music in iTunes, copying photos from an external hard drive to iPhoto, and using Facebook in Safari.
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Ciao.

Why my macbook pro getting so hot while using two or more simple application???

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