You can program your DVR with a remote control.
No, you will need the remote that goes with the tivo dvr.
Yes it can be done manually from the tivo home base unit functions located on the dvr,but you will be limited to common "vcr" type functions unlike advanced controls available with utilizing the remote control features.
Yes! to program your remote,
No, the dish network remote only has those codes. If you want to control everything, get a Logitech Harmony remote.
As the Bose 321 has its own universal remote, it is unlikely that a code-based remote would operate all of the functions. It would be easier to use the Bose remote program the functions of the TV and other units. If you have lost your Bose remote, it is likely that only an advanced remote, such as the Logitech Harmony series would be able to replace it.
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I need the device code number to enter into my Dish DVR remote so the Harmon dvd will operate from that remote.
You just might have a selector switch which determines which output the DVR/DVD player has. It could be on the remote control or possibly, a button on the unit.
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There are several sites that offer Philips remote programming instructions. A link is provided.