You can always plug in a USB keyboard. Or, download a program called KMTTG to the computer, which has a remote function, as well as ability to download shows.
Original S1 (Recycle Heaven)
Series 2 (PLS, sold)
TiVo HD (XL, PLS, "652")
Juliet Basic (4XL, PLS)
The TiVo Apocalypse begins on Sat 2013 Feb 16 00:00 GMT!