It's something built in the system . Sometimes it's able to detect a captive portal and it displays it in a separate window.

It's not really a separate program, just a window with a WebView.

Also, if you have a iDevice you'll see a similar feature.

It's something built in the system . Sometimes it's able to detect a captive portal and it displays it in a separate window.

As @George Garside pointed out, it's a separate program located at /System/Library/CoreServices/Captive Network Assistant.app.

Also, if you have a iDevice you'll see a similar feature.

It's something built in the system. Sometimes it's able to detect a captive portal and it displays it in a separate window.

It's not really a separate program, just a window with a WebView.

It's something built in the system  . Sometimes it's able to detect a captive portal and it displays it in a separate window.

It's not really a separate program, just a window with a WebView.

Also, if you have a iDevice you'll see a similar feature.