As most anyone who has seen an iPad knows, there are four apps in the bottom section of the iPad's screen, called the tray.
But did you know that you're not limited to just four apps, as you are on the iPhone or iPod touch? In fact, the iPad can have up to six apps in its tray, which can make it easier for you to access your most important apps.
To put additional apps in the iPad tray, simply follow the process you would to rearrange apps (hold down on any app icon until they are start wiggling). Then, drag the app you want to the tray and let it go. Do this until you've got all the apps in the tray that you want and then click the home button. This will stop the apps wiggling and will save your changes.