This document describes how an AppServer V11 and an AppServer V12 can be operated in parallel. Both versions use the same CADENAS_DATA and the same database. Version V11 is used to install catalogs, change ERP data or update catalogs with PLMSynchro. Version V12 is used to display and search the catalogs with 3Dfindit. No catalogs are installed or ERP numbers added with V12.