specify the target instance for a command using its adb-assigned serial number.
You can use the <code>devices</code> command to obtain the serial numbers of running
emulator/device instances. For example: </p>

<pre class="no-pretty-print">adb -s emulator-5556 install helloWorld.apk</pre>

<p>Note that, if you issue a command without specifying a target emulator/device instance
while multiple devices are available, adb generates an error.

<p>If you have multiple devices available (hardware or emulated), bu