Here is how basic authentication dialog looks like in Chrome:

The best way to interact with the basic authentication dialog is to simulate input via keyboard. Starting from Rapise 6.5 you may use the following simple function:

function BasicAuth(/**string*/ url, /**string*/ usr, /**string*/ pwd)
{
	Navigator.LaunchBrowser(url);
	Global.DoSleep(3000);
	Global.DoSendText(usr);
	Global.DoSleep(1000);
	Global.DoSendKeys("{TAB}");
	Global.DoSleep(1000);
	Global.DoSendText(pwd);
	Global.DoSleep(1000);
	Global.DoSendKeys("{TAB}");
	Global.DoSleep(1000);
	Global.DoSendKeys("{ENTER}");
	Navigator.Open();
}

The function launches a browser based on a selected profile, inputs and submits credentials, and finally connects to the browser.

Place the function into User.js file and call from RVL like this: