Sir, I am doing Win CE 6.0 base application. In that i have to use given function: SetMapMode(), SetWindowExtEx(), SetViewportExtEx() functions and set the mode MM_ANISOTROPIC. But while compliing, it will give the error as Undeclared identifier for given functions. How i can use these function in my application?. I already gone through msdn "Building Portable Windows Mobile-Based Application". In this topic, mention that you can use UNDER_CE for Win CE and UNDER_NT for Windows Operating System. How can i use the above functions using UNDER_NT macro in my application. Please give any hint or any method to use the above functions. Thanks in advance......