MacOSX Mavericks - Enable the Do not disturb feature

MacOSX Mavericks include a new feature to temporarily disable all notifications. The Do not disturb feature allows you to turn off notifications for a given period of time, which can be convenient in certain situations:

• Making a presentation.
• watching a movie.

To access this new feature, first open the Notification Center:

• Apple menu > System Preferences > Notifications
• In the left pane, select the "Do not disturb" option and configure your settings:

How to create a group on WhatsApp?
Among the many features available under Whatsapp there is a very interesting one: the group discussion. It allows you to interact in real time with a group of people (up to 50 people). 
To create a group under Whatsapp

• Open the "Conversations" window.
• Click on "New Group".

• In "Subject", enter the Group name.
• Add people you want to be part of your group.
• Click "Done".

thanks to en.kioskea.net