get NIDAQmx task handle

I'm using Data Acquisition toolbox legacy interface to control NI-PCI 6115. In NIDAQmx terminology, if I create an analog input or output object, I create a task. The task is identified by a task handle, an integer type UINT32. Is there a way to get the NIDAQmx task handle of analog input/output objects created by Matlab Data Acquisition toolbox? I need it in order to modify NIDAQmx properties unsupported by Matlab.