Uma,
These functions are provided by the NI-DAQ driver. They are documented in the following location:
Start >> Programs >> National Instruments >> NI-DAQ >> NI-DAQ Function Reference Help
In CVI, if you have NI-DAQ installed correctly, you can access these functions from Library >> Data Acquisition. If this library is unavailable, you will need to uninstall and reinstall NI-DAQ. During the installation, verify that support for CVI is being installed. Finally, I would suggest that you examine the following example programs when you begin programming your PCI-6035E in CVI:
C:\Program Files\National Instruments\MeasurementStudio\CVI\samples\daq
Good luck with your application.
Spencer S.