AEAddressDesc
Every Apple event includes an attribute that contains the address of the target
application. A descriptor record that contains an application's address is called
an address descriptor record.The address in an address descriptor record can
be specified as an application signature, a process serial number, a session
reference number, a target ID record, or a data type that you define.
Like several of the other data structures defined by the
parameters, an address descriptor record is identical to a descriptor record of
data type AEDesc; the only difference is that an address descriptor record must always contain an application's address.