If you happen to close the Web server activity window by accident in 4D Business Kit, you can always find it and re-open it. Go the Tools menu on the menu bar, and select "Web server activity…." You can also re-open the Web server activity window by pressing [Control + *].
Note: [Control + Shift + 8] will only work for the Windows version only. The "*" key should be one of the right-most keys on top of the number pad.