Remote Communication—Computer processing is typically synchronous—that is, a procedure waits while its subprocedure executes. However, calling a remote subprocedure is much slower than a local one so that a procedure may not want to wait for the subprocedure to complete; instead, it may want to invoke the subprocedure asynchronously, that is, starting the subprocedure but continuing with its own processing simultaneously. Asynchronicity can make for a much more efficient solution, but such a solution is also more complex to design, develop, and debug.
