Today, development tools integrate their own Flash loader utilities to program the application during debug phase which is the simplest way to debug an application. For the boards that do not embed any JTAG interfaces or for demo purposes, the SAM Boot Assistant (SAM-BA™) GUI is the solution. The SAM-BA software provides a means of easily programming various Microchip AT91 ARM Thumb based devices. It runs on Windows 2000 and XP and allows communication with the target device through an RS232 serial port, USB or a JTAG/ICE interface. The SAM-BA UI is based on a central DLL called AT91Boot_DLL.dll that can be used by the customer to create a custom GUI interface.