New user, transfer between 2 dvrs?

I just had my service installed yesterday and have a few questions that I'm hoping the community can answer for me.

I received 2 of the R22-100 DVR's and am wondering if there is anyway to stream a show recorded on one to the other DVR. I do have both devices plugged into an ethernet jack and they are seen on the network.

Along the same lines can I stream content from a PC (I use linux) to the DVR, or less likely pull recordings from the DVR to the PC?

Lastly I noticed the DVR's have both USB and ESATA ports, if I can't move stuff over the network can I get either a USB or ESATA external hard drive and transfer content that way?

I'm coming from a TIVO DVR and had it rather extensively hacked so I'd like to get some of the features I'm used to out of the dish DVRs, otherwise I'll have to purchase an IR adaptor for the TV and use it in conjunction with a standard reciever as well, but I'd still like my wife to be able to use the Dish DVR.