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With Visual Studio 2005, you can debug a 64-bit application running on the local machine or on a remote machine.

If you are debugging locally, Visual Studio 2005 runs under WOW64, the 32-bit x86 emulator that allows 32-bit Windows applications to run on 64-bit Windows. Local debugging under WOW64 is supported on x64 only.

If you are debugging remotely, Visual Studio 2005 can run under WOW64 or on a 32-bit machine. You can debug both IA64 and x64 applications, as well as 32-bit applications running under or x64 WOW mode or on 32-bit platforms.

To debug a 64-bit application running on a remote computer, you need to install the 64-bit remote debugger on the remote computer. The 64-bit remote debugger is available on the last disc of your Visual Studio 2005 installation set.

If you debug a 64-bit application on the local machine, Visual Studio 2005 uses remote debugging to connect between WOW64 and the 64-bit application on the same machine. For more information, see Debugging on a 64-Bit Platform. The remote debugging components will be installed automatically when you install Visual Studio 2005 on the machine.

In either case, installing remote debugging on a 64-bit machine installs both the 32-bit and 64-bit versions of the Remote Debugging Monitor. To debug a 64-bit application, you must use the correct version, which is Remote Debugger (x64) on the Start menu.

Debugging 64-bit code is almost identical to debugging 32-bit code. However, there are two differences:

• Edit and Continue is not available for 64-bit debugging.

• You cannot debug in mixed-mode, calls from native code to managed code, or vice versa, in 64-bit code.

For information about installing 64-bit remote debugging components, see How to: Set Up Remote Debugging.

To start the 64-bit Remote Debugging Monitor

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