A few options:
1) Store the "out" values in global macros. Whenever a step completes, if global macros have been modified, they are written to the global macros file, and when a step starts, if the global macros file is newer than the ones that are loaded (i.e., were modified in another instance of VBP), they are re-loaded from disk.
2) Store the values in an INI file using the Write INI action, and read them using the READ_INI system macro. You could also write/read an XML document, a plain file, etc.
3) Instead of using separate project files for the master/library steps, use subroutines in a single project file. Store "out" values in temporary macros in the subroutines.
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