Not always.
I try to be quite strict otherwise, if I was having a hard day, it would be too easy to think "sod it" and wander through into the kitchen.
I run 4 computers here, Sachs.
1 is for client jobs, and it runs all the time. It's not connected online, so it's immune from viruses.
2 is for my accounts, and I just use it when it's needed.
3 is for serious stuff, business email and so on. It runs 24/7 ... you never know when a juicy job could come in.
4 is my fun lappy, the one I use for AB, YouTube, buying stuff online, etc. I carry it around the flat, so one day the hard disk will probably scrape against its housing and corrupt itself. I even sit in bed with it sometimes.