My question is two-fold: 1) Since a function is available for testing the ability to save data over a session boundary (What is a "session boundary" anyway?), what kind of conditions could prevent the data from being saved? 2) Are there any limitations to the amount of data that can be saved in the drawing dictionary? I've succesfully written an 80K list without a problem, but I'd like to know if the limit (If one exists) is determined by the AutoCAD program itself or the system resources. I'm working on a 3.4GHz w/ 2G ram, but could somebody on 450MHz with 128 MB ram write the data just the same? TIA