User mode.
Seriously, that's what it's called.
Xp mode
compatibility mode
The Windows XP Architecture uses both Kernel Mode and User Mode. The kernel mode is the layer of the operating system's code that is responsible for handling such fundamental operating system items as virtual memory and scheduling which applications will run at any given time. User mode is where your actual program runs and is controlled by components of the kernel. For example, the kernel is responsible for allocating the memory that an application uses.
It displays the opening screen of any application a user opens It displays the logon screen, prompts, and windows It can run DirectX applications in full-screen mode
Windows 7 Professional is designed to help unlock any limited functionality businesses may experience and significantly reduce error messages, Windows 7 Professional offers a new feature, Windows XP Mode. Designed with small businesses in mind, Windows XP Mode works with Windows 7 Professional to extend the lifecycle of your existing software, such as accounting, inventory, and other line-of-business applications. Windows XP Mode does not require hardware virtualization technology to run, and can enable you to run existing or older applications right from the Windows 7 Professional desktop. With Windows XP Mode, you can get the most from your business software investments and reduce the potential for downtime when using business-critical legacy applications.
Try to run it in Windows mode.
User account control settings.
Windows Vista can already run most XP applications, with no need for any additional software.
No. Regardless of what user you are running as, all your tasks are run in user mode. Supervisor mode is reserved for kernel-level processes.
They are "compatible" in the sense that many applications that run on Windows XP will run on Windows Vista.
Yes.
Many applications and games written for or compatible with Windows 98 will run on Windows Vista.