PDOs can be sent synchronously or asynchronously. This may be done synchronously or asynchronously. Vectored I/O can operate synchronously or asynchronously. This type of training can be delivered synchronously or asynchronously. Showers can be executed in both clockwise and anti-clockwise directions, and both asynchronously and synchronously. India's National Grid is synchronously interconnected to Bhutan, and asynchronously linked with Bangladesh and Nepal. Notifications are then sent asynchronously using the <notification> construct. Machines using MIMD have a number of processors that function asynchronously and independently. These allow programs to easily exchange data between threads asynchronously. It asynchronously writes data to disk after acknowledging to the client. In this case the asynchronously transferred blocks are called data packets, for example ATM cells. The event loop almost always operates asynchronously with the message originator. Because message-based communication inherently functions asynchronously, it may not fit well in such situations. The left and right tymbals emit pulses slightly asynchronously. This list is asynchronously updated as the user types.