function _doXHR(data) {
			var self = this;
			
			_start_time = new Date().getTime();

			_xhr = new RuntimeTarget();

			function loadEnd() {
				if (_xhr) { // it could have been destroyed by now
					_xhr.destroy();
					_xhr = null;
				}
				self.dispatchEvent('loadend');
				self = null;
			}

			function exec(runtime) {
				_xhr.bind('LoadStart', function(e) {
					_p('readyState', XMLHttpRequest.LOADING);
					self.dispatchEvent('readystatechange');

					self.dispatchEvent(e);
					
					if (_upload_events_flag) {
						self.upload.dispatchEvent(e);
					}
				});
				
				_xhr.bind('Progress', function(e) {
					if (_p('readyState') !== XMLHttpRequest.LOADING) {
						_p('readyState', XMLHttpRequest.LOADING); // LoadStart unreliable (in Flash for example)
						self.dispatchEvent('readystatechange');
					}
					self.dispatchEvent(e);
				});
				
				_xhr.bind('UploadProgress', function(e) {
					if (_upload_events_flag) {
						self.upload.dispatchEvent({
							type: 'progress',
							lengthComputable: false,
							total: e.total,
							loaded: e.loaded
						});
					}
				});
				
				_xhr.bind('Load', function(e) {
					_p('readyState', XMLHttpRequest.DONE);
					_p('status', Number(runtime.exec.call(_xhr, 'XMLHttpRequest', 'getStatus') || 0));
					_p('statusText', httpCode[_p('status')] || "");
					
					_p('response', runtime.exec.call(_xhr, 'XMLHttpRequest', 'getResponse', _p('responseType')));

					if (!!~Basic.inArray(_p('responseType'), ['text', ''])) {
						_p('responseText', _p('response'));
					} else if (_p('responseType') === 'document') {
						_p('responseXML', _p('response'));
					}

					_responseHeaders = runtime.exec.call(_xhr, 'XMLHttpRequest', 'getAllResponseHeaders');

					self.dispatchEvent('readystatechange');
					
					if (_p('status') > 0) { // status 0 usually means that server is unreachable
						if (_upload_events_flag) {
							self.upload.dispatchEvent(e);
						}
						self.dispatchEvent(e);
					} else {
						_error_flag = true;
						self.dispatchEvent('error');
					}
					loadEnd();
				});

				_xhr.bind('Abort', function(e) {
					self.dispatchEvent(e);
					loadEnd();
				});
				
				_xhr.bind('Error', function(e) {
					_error_flag = true;
					_p('readyState', XMLHttpRequest.DONE);
					self.dispatchEvent('readystatechange');
					_upload_complete_flag = true;
					self.dispatchEvent(e);
					loadEnd();
				});

				runtime.exec.call(_xhr, 'XMLHttpRequest', 'send', {
					url: _url,
					method: _method,
					async: _async,
					user: _user,
					password: _password,
					headers: _headers,
					mimeType: _mimeType,
					encoding: _encoding,
					responseType: self.responseType,
					withCredentials: self.withCredentials,
					options: _options
				}, data);
			}

			// clarify our requirements
			if (typeof(_options.required_caps) === 'string') {
				_options.required_caps = Runtime.parseCaps(_options.required_caps);
			}

			_options.required_caps = Basic.extend({}, _options.required_caps, {
				return_response_type: self.responseType
			});

			if (data instanceof FormData) {
				_options.required_caps.send_multipart = true;
			}

			if (!Basic.isEmptyObj(_headers)) {
				_options.required_caps.send_custom_headers = true;
			}

			if (!_same_origin_flag) {
				_options.required_caps.do_cors = true;
			}
			

			if (_options.ruid) { // we do not need to wait if we can connect directly
				exec(_xhr.connectRuntime(_options));
			} else {
				_xhr.bind('RuntimeInit', function(e, runtime) {
					exec(runtime);
				});
				_xhr.bind('RuntimeError', function(e, err) {
					self.dispatchEvent('RuntimeError', err);
				});
				_xhr.connectRuntime(_options);
			}
		}
Cancels any network activity.
			
			@method abort