1 - I think it would be useful that the GUI has a static column on the left that shows the numbers.
So user can see the number of computers dynamically. But it will be useful if it's static, like in the attachement. (Attachement1.jpg)
With this column user can see the number of computers and can see number of all computers has shared folder, .com name dynamically etc.
2 - Ability to change the position of tabs. I mean, for example user can change the positions of IP adress tab and mac adress tab. So user can modify the order of tabs.