Assuming you are running Call Accounting Mate on port 80 on a machine with the IP address of 192.168.1.1. All you have to do is using a PC on the LAN, just point the browser to
http://192.168.1.1 . You should get the login screen. If you are running on another port, use
http://192.168.1.1:xx where xx is the port that the software is running on.
This is a built in design of Call Accounting Mate to be able to access it using a browser. No configuration is required where the software is running to enable this feature.