Answer:
To send the asynchronous GET request to the server, you should use the `XMLHttpRequest.send()` method. Here is an example:
```javascript
const xhr = new XMLHttpRequest();
xhr.open('GET', 'action.pl', true);
xhr.onreadystatechange = function() {
if (xhr.readyState === 4 && xhr.status === 200) {
// do something with the response
}
};
xhr.send();
```
In this example, `xhr.open()` is used to define the request and `xhr.onreadystatechange` is used to define a function that will be called when the response is received. The `xhr.send()` method is then called to actually send the request to the server.
Step-by-step explanation:
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