iFile is a program that allows people to use File Transfer Protocol to transfer files to their iPod Touches, iPads and iPhones. Once these devices are jailbroken -- removing Apple's default restrictions so third-party applications can be installed -- your computer can gain access to them to transfer files and programs. They can be jailbroken through software packages such as Redsn0w or Blackrain. You don't have to be a networking genius to do this. You can install applications (IPA files) onto your devices by using the iFile program. But beware ... doing so may void your warranty.
Connect the iPod, iPad or iPhone to your home's network by clicking on the "Settings" button. Click on the "Wi-Fi" button, then select your home network from the list of networks that appears.
Open the iFile program on your device by clicking on the "iFile" icon.
Open your SSH program and enter your device's IP address in the "Address" field.
Type "root" in the username field, then type "alpine" in the password field.
Click "Connect" on your SSH program to connect to the device.
Locate the IPA file on your computer, and drag the icon to the "Applications" folder on the device to install it.
Although not actually illegal, jailbreaking may void your device's warranty as stated on Apple's support site: "Apple strongly cautions against installing any software that hacks the iOS. It is also important to note that unauthorized modification of the iOS is a violation of the iPhone end-user license agreement and because of this, Apple may deny service for an iPhone, iPad, or iPod touch that has installed any unauthorized software."