Please check Dot Net Platform is installed in your system. Run the utility available in the bin directory, Check_Dot_Net_version.exe , It will tell you the Dot Net version. If Dot Net platform is not available in the system, download the platform. Please see the software requirements page for downloading the platform.
Yes, you can monitor 10 servers simultaneously.
Yes, the ping data are shown in the graphical format in the "Graph" tab.
Yes, The refresh interval can be modified.
Yes, The Free Ping Tool can monitor external websites also. If the servers /websites are reachable then It can be monitored.
Yes, the Free Ping tool can monitor more than two servers at a time. It can monitor maximum of 10 servers simultaneously.