le sharing of <a href="dart-isolate/SendPort-class.html">SendPort</a>s across <a href="dart-isolate/Isolate-class.html">Isolate</a>s.</p>
<p>All isolates share a global mapping of names to ports. An isolate can
register a <a href="dart-isolate/SendPort-class.html">SendPort</a> with a given name using <a href="dart-ui/IsolateNameServer/registerPortWithName.html">registerPortWithName</a>;
another isolate can then look up that port using <a href="dart-ui/IsolateNameServer/lookupPortByName.html">lookupPortByNam