Writing to this object initiates the upload/download or
schedules one. The extremeFileTransferStartOperStatus object
should be checked before attempting to set this object.
This object cannot be modified while the
extremeFileTransferStartOperStatus is inProgress(3). This
object can be set start(1) only if the
extremeFileTransferStartOperStatus is idle(1). A scheduled
upload/download will be cancelled by setting the value of
this object to cancel(2).