No, "Not for prolonged use at 100% CPU in a hot humid room".
Why do you always play this silly game?
My silly archaism is aimed at the advertising hyperbole and documentation of the manufacturers that lead one to believe that laptops are somehow more durable than there desktop computers.
But to tell the truth, some engineers that ought to know better do not understand the art and science of cooling small compact electronic devices that have significant heat generation.
The following information is available, but not in the advertising and documentation most nusers get.
Tradeoffs
Typically buying a ruggedized laptop implies compromising on few desirable features: A ruggedized laptop is in general lower performance, more expensive and heavier. A rugged laptop is not a cheap laptop. E.g. the Dell Latitude ATG starts at $2049 and the Dell Latitude XFR starts at $3899 (March 08), which is at least $1000 more than the equivalent mainstream laptop from Dell. Also, note that if you intend to use the laptop in bright outdoor conditions, you will be cranking up the screen brightness to its highest level - which will result in faster battery drainage - so, consider getting a higher cell battery if such an option is available.
The key factors to keep in mind while buying a rugged laptop are:
Do you really need a rugged laptop? i.e. do you need to spend the extra money and live with potentially reduced performance and features. Perhaps a water resistant & drop protection laptop case will do?
What kind of hazards do you think your laptop will be subjected to?
What is your usage environment for this laptop? Will it be mounted in your car?
http://www.linux-laptop.net/rugged-laptop.html
This inside of a car can get over 104 F (40 C) in a short while, even on a 'nice day.' It may take the laptop inside the car twenty minuets to get back to a normal temperature.
But did you sees that in the user guide? The one that came with the new laptop?