Vcr Dvd Combo With Digital Tuner Works Great For Me.... Hi, I Have Questions On How A Dvd Recorder Works?

Hi, i have questions on how a dvd recorder works? - vcr dvd combo with digital tuner works great for me....

I think it a VCR / DVD recorder drive of my mother for Christmas.

1) Is it really complicated to use? she wears a VCR, but not very smart with the new technology.

2) When recording on a normal DVD (not rewritable), you can create a program to see and so for the record, then the recording on the DVD until full? or something of registration, the fact that the DVD? For this reason, it makes sense to spend more money for DVD-RW?

3) The main objective is to record TV on DVD, the recorder is a tunerless Comcast cable box, but is used for high-definition digital cable, the picture as a signal receiver to be used use for TV recording?

4) You can watch a program while recording another?