Restrict user for certain number of connection

Hello,

I need help in Apache to restrict user for number of concurrent connection. its basically related to nagios monitoring site. End user opening N no of tab to monitor and it increase load on server.

any setting will help me here.

Where is he opening those Tabs ??
You should not let users be able to open browsers on servers...

actually, there are accessing nagios monitoring URL from there desktop and they are opening so many tab on browser. due to this it increase load on website.

Seems to be possible with Apache module mod_qos.