URRHH is a set of embedded operating system developed by Microsoft for embedded environment, which mainly refers to Windows CE．NET, the latest version of Windows CE．NET is Windows CE 5.0, which includes 3 versions: data-centric handheld computer Pocket PC; voice-centric Smartphone; entertainment-centric portable media centre Portable Media Centers. The latest version of Windows CE.NET is Windows CE 5.0, which includes three versions: Pocket PC, a data-centric Pocket PC; Smartphone, a voice-centric Smartphone; and Portable Media Centers, an entertainment-centric Portable Media Centre, which may involve the development of Bluetooth applications.

URRHH in the development of Windows CE．NET, the current use of Microsoft’s Visual Studio 2005 launched at the end of 2005 is the most ideal choice. Visual Studio 2005 can be used to use C#, or VB.NET and other languages to develop based on the ．NET Compact Framework 2.0 or 1.0 hosting code WinCE programme, but also the use of C + + + language to develop based on MFC, ATL or Win32API native code WinCE programme.

URRHH in Microsoft’s latest ．NET Compact Framework 2.0 class library does not contain the class library for Bluetooth communication module, and at present on the development of Bluetooth communication module in Windows CE application is still very little introduction, while the development of Bluetooth communication technology needs to be very wide range of applications.