I often have the situation in which I want to test a portion of my VI without running the entire VI. To accomplish this, I usually copy and paste the code fragment into a new VI and run it. When I'm finished, I close out the new VI without saving it. I've often wanted to simply select a code fragment and run just that part. For example, by right-clicking on the code fragment and selecting "run". It would be a nice little time saver. Of course, this would really only be feasible in certain situations: namely in which the code does not have any dependencies on other code sections. This essentially means that all the inputs are controls or diagram constants and all outputs are indicators. This seems like it would be easy to add to LabVIEW since it is just a subset of existing functionality. Other implementations would probably be more trouble than they are worth.