Hi bmitan,
First you will need to install the latest version of the drivers:
Currently -
NI-DAQmx Version 8.1 for Windows 2000/XPThen you can do exactly what you want by creating a simulated device.
Here are the details:
Tutorial: NI-DAQmx Simulated DevicesBasically you can develop the application just as if there was something connected and you can test it for any logical errors. However, keep in mind that since this is a simulation you will not have all features available or if they are available it may not occur with the same timing.
Regards,