Retrieve a property:
property_get -i 16 -d 0 -n a
response:
<response command="property_get" transaction_id="16">
<property name="a" fullname="\$a" address="140272044"
type="int"><![CDATA[7]]></property>
</response>
Change a property:
property_set -i 18 -d 0 -n $a -- OA==
response:
<response command="property_set" transaction_id="18"
success="1"></response>