= Using the Microsoft and Safari Symbol Servers = Follow the [http://developer.apple.com/internet/safari/windows_symbols_agree.html instructions for using the Microsoft and Safari symbol servers] so that Visual Studio can show you backtraces that involve closed-source components. = Watch Window = You can open any of the Watch windows using the `Debug > Windows > Watch` submenu. [http://msdn.microsoft.com/en-us/magazine/default.aspx MSDN Magazine] published a very useful [http://msdn.microsoft.com/en-us/magazine/dd252945.aspx article about Watch window pseudo-variables and format specifiers]. Those of particular interest to WebKit developers are mentioned explicitly below, but the whole article is worth a read. Adding `$err,hr` to the Watch Window will show you what `::GetLastError()` would return at this moment, and will show you both the numerical error value and the error string associated with it. = Calling CFShow = When debugging code that uses CF types, you can invoke the [http://developer.apple.com/mac/library/documentation/CoreFoundation/Reference/CFTypeRef/Reference/reference.html#//apple_ref/c/func/CFShow CFShow] function in the Immediate window (`Debug > Windows > Immediate` or `Ctrl+Alt+I`) to print a debug description of a CF object to the Output window like so: {{{ {,,CoreFoundation}CFShow((void*)0x12345678) }}} Note that you usually won't be able to pass a variable name as the parameter to `CFShow`, as the Immediate window will get confused and think you're specifying a symbol in CoreFoundation.dll rather than whatever code you're debugging. It's usually easiest just to pass the address of the object directly as above. = Debugging Multi-Process Applications = You can attach a single debugger to more than one process. To do this, launch or attach to the first process, then use `Tools > Attach to Process…` or `Ctrl+Alt+P` to attach to the second process. Your breakpoints will apply to both processes. There are two ways to see which process the debugger is currently operating on, and to switch the current process: the Processes window and the Debug Location toolbar. You can open the Processes window using `Debug > Windows > Processes` or `Ctrl+Shift+Alt+P`. You can show the Debug Location toolbar using `View > Toolbars > Debug Location`. Visual Studio will always pause all processes (i.e., you can't pause just one process). Similarly, Visual Studio will always step all processes when using the Step In/Over/Out commands. = Inspecting WebKit2 API types = You can inspect WebKit2 API types in Visual Studio by casting them to their underlying WebKit2 implementation type. For example, say you have a `WKMutableDictionaryRef` that points to address `0x12345678` and want to see what it contains. You can view its contents using the following watch expression (in either the Watch Window or Quick Watch Window): {{{ {,,WebKit}(WebKit::MutableDictionary*)0x12345678 }}} The same technique will work for other WebKit2 API types as long as you substitute the appropriate type for `MutableDictionary` above.