I haven't looked to see if I can find a manual online but the blurb on the innovage website for the jumbo remote says it as a code search button. The manual should tell you how to work it.
How the code search button normally works is you turn on the device, set the remote to control that sort of device, activate the code search then continually press the on/off button on the remote until the device turns off. At that point you lock in the device in some way. It can take a long while to find the device since there could be hundreds of codes to go through before you find it.
Of course you could just be out of luck and the remote won't control your device.
This forum at remotecentral states the remote may use the same codes as a GE remote and links to a site the shows the code for Norcent DVD as being 317, 318, 319, 905, 907.