In LabVIEW 8, you must create a built specification. In the project window, click on build specification and select "new...shared library (dll)".
In the "source files" section, you must add the desired VIs and define their prototype. Make sure to assign terminals to the FP object you want to define, objects that don't have a terminal assigned in the connetctor pane won't show up in the prototype dialog.
I would recommend to make your first VI in to a usable regular subVI with all desired inputs and outputs defined in the connector pane.
Check the online help for more details.
Message Edited by altenbach on 06-16-2006 02:21 PM