Your DNS cache stores the locations (IP addresses) of pages you have recently viewed. DNS cache help to speeds up the lookups within the same host. But sometimes if the website page change before your DNS cache is updated, you will failed to access the page. For example, you received a web page with HTML 404 error codes. So you need to flush your DNS cache. Once you clear your DNS cache, your computer will query nameservers for the new DNS information you require.
Shutdown is a very useful command that can help your daily administrative task. This program allows you to restart or shutdown your local or remote computers.
To access shutdown command, simply go to DOS command prompt by clicking on Start -> All Programs -> Accessories -> Command Prompt or Start -> Run and then type in cmd to launch a command prompt window.
Dropbox is a free service that lets you bring all your photos, docs, and videos anywhere. Dropbox provides users with 2 GB of space for free, and they can pay for more. Dropbox support Windows, Mac OS X, Fedora, Ubuntu, iPad, iPhone, Android and Blackberry.
After you install Dropbox on your computer, any file you save to your Dropbox will automatically save to all your computers, your iPhone and iPad and even the Dropbox website.
To know more about Dropbox, click HERE to visit Dropbox web site.