PS You will probably not be using the AIM*OPC if you want to build blocks in IA. The AIM*OPC is for the historian interface. It's pretty cool also but it sounds like you want control blocks. Chuck Leddon 770-331-4303 _______________________________________________________________________ This mailing list is neither sponsored nor endorsed by Invensys Process Systems (formerly The Foxboro Company). Use the info you obtain here at your own risks. Read http://www.thecassandraproject.org/disclaimer.html foxboro mailing list: //www.freelists.org/list/foxboro to subscribe: mailto:foxboro-request@xxxxxxxxxxxxx?subject=join to unsubscribe: mailto:foxboro-request@xxxxxxxxxxxxx?subject=leave