DVD key controls the VCR or DVD functions, respectively.Once programmed successfully, the TV key controls the TV functions on your unit, and the VCR In order to control combo units, like TV/VCRs or TV/DVDs, you must program the individual corresponding component keys to control each part of the combo unit. Most components can be programmed in one of these four ways. There are four methods you can use to program your remote control to operate your components: The code finder takes you right to the best code(s) for your component-no need to go through long code lists! The online interactive code finder at makes it easier to find exactly the right codes for your components. Each brand and each component has its own “language,” and, by programming the correct codes into your remote, you tell the remote to “speak the same language” as your components. These codes enable the remote to communicate with your components. In order for your universal remote to control your components, you need to program the remote with the codes that match the components (See Code Lists enclosed). Your universal remote can operate a variety of brands of components. Programming the RCA RCR312WR Remote Control