While editing source code in the C/C++ editor, you can select a function name and press F3, to make the editor immediately jump to the prototype for that function (if the corresponding file is also in your project). Or, you can press Ctrl and click to navigate to the prototype. Also, you can navigate to files (such as headers) outside of the workspace (i.e. in the QNX target directories).
Pressing Ctrl–F3 makes the editor immediately jump to the function's implementation (if the file is also in your project).