[EricH]

I would consider all the rules in Section 4.1.11 very carefully before making the call either way. However, there are a few that I would particularly look at:

[R80], blue box, second paragraph says that no power will be available for something other than the Classmate. However, any computing device may be used to host the Driver Station software (well, as long as it can connect to the field via Ethernet--[R81]).

[R84] bans wireless communication to, from, or within the console, except via the Arena system.

From Section 5, Rule [T34] is also worth looking at; it puts a list of requirements on devices for tracking strategy. One of those requirements is that any device used only for strategy cannot connect to the Operator Console (among other rules). Not knowing what the second computer would be used for, I include this just in case it's solely for strategy.

Beyond those, I don't think there are any restrictions on number of computers used on the Operator Console, but space should be considered--you only have 4' to work with.