There are three layers available only to Microsoft to deliver the base application. Layer SYS, SYP System layer: The standard application is developed in this lowest layer. This includes the core application and the localization for most countries. GLS, GLP Globalization layer: Includes features developed for some countries that were not yet moved into the SYS layer. FPK, FPP Feature Pack layer: Includes industry feature packs that are controlled by Microsoft. There are three layers available to partners and ISVs. Layers SLN, SLP Solution layer: Includes Microsoft endorsed industry solutions. ISV, ISP Independent Software Vendor layer: Includes generic or vertical solutions developed by ISV's. VAR,VAP Value Added Reseller layer: Includes multi-customer solutions developed by VAR's. There are two layers available to both partners and customers who have a license to access the AX source code. Layer CUS, CUP Customer layer: Includes customer specific ...