I am trying to programmatically find the Startup VI, if any, of the build spec. I went through the steps you outlined above, and have found Tags SourceItem[5].Inclusion and SourceItem[5].ItemID which are "Startup VI" and "0xA1B0048A", respectively. I don't know what that hex number is. Using a similar process, I went through the project heirarchy and get the ProjectItem "ItemID" of the VI which I know is the Startup VI, but the two numbers are not equal. How can I get from the BuildSpec ItemID to the VI name/reference.