IFCs are frequently used in BIM projects.
In means to follow the progress of the project, GUID element's in IFC created whit Advance Steel needs to be frozen. Thus, others programs (like Tekla) can show evolutions between two IFCs. This is the same principle as the Synchronisation function in Advance Steel with Robot Structural Analysis.
The goal is to locate new elements, delated elements (on the old IFC), modified elements and unmodified elements following deisgn changes during the project.