Normally a save session by a python extension is invoked by a trigger SAVE_SESSION. For restoring a session, several related chimera APIs are available that are typically not used. 1) post model restore: SimpleSession.registerAfterModelsCB(afterModelsRestoredCB, arg) 2) BEGIN_RESTORE_SESSION and END_RESTORE_SESSION triggers. I need to reset extension gui values based on midas positions. I presume a normal restore in the session file does not guarantee that these midas positions will be loaded at that time, so I need to delay the gui updates until the restore process has ended or possibly when the models are loaded loaded. What is the distinction between END_RESTORE_SESSION and registerAfterModelsCB? Matthew Dougherty National Center for Macromolecular Imaging Baylor College of Medicine ===========================================================================