I want to know exact differences between kile compilation tools and realview compilation tools and also I want to know whether ARTX works with both legacy keil compilation tools and realview compilation tools (for example as provided in MDK-KEIL package) Also I am thankfull for any other info relating to using ARTX with this package or any sample project working with ARTX with Realview compilation tools ------------------------------------------- The Keil's Website Says: Keil Tools let you choose which Compiler and Assembler to use. Choose the RealView Compilation Tools if your goal is to use the industry-standard development tools from ARM. Choose the Keil CARM C Compiler if your goal is maintain projects created with the legacy Keil compilation tools. Choose the FREE GNU Compiler if your goal is to reduce development tools cost.