class="block">A client request invocation.

 An invocation is a request that has been prepared and is ready for execution. Invocations provide a generic (command)
 interface that enables a separation of concerns between the creator and the submitter. In particular, the submitter
 does not need to know how the invocation was prepared, but only how it should be executed (synchronously or
 asynchronously) and when.</div>
<dl class="notes">
<dt>Author:</dt>
<dd>Marek Potociar, Santiago Pericas-Geertsen</dd>
<dt