You are trying to install or open an app that didn't come from the Mac App Store but you got a message saying App can't be opened because it is from an unidentified developer. This is how you bypass it.
If you don't want anybody to see your profile on your computer you can lock it with the password. In this lesson I will show you how you can set different password options to log in, in Windows 8.
In this lesson I will show you how to create a web link on specific part of the picture and how to define a link that opens when a user clicks the hotspot area.
From the Photos app you can email only up to five photos at once. Let me show you a nice little trick which will let you send more than five images in a single email.