Ctrl + - Show #Include file
 Display #include file.
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 To use this option, you must first make sure that the source code window is
 the currently selected window. Move the cursor to a line that contains a
 #INCLUDE directive and press <Ctrl><+>. The source code window will then
 display the #INCLUDE file.

 MrDebug, first searches the current directory for the .CH file, if it cannot
 be found in the current directory, it then proceeds to search the following
 places:

        the Path for Source setting - under the options menu,
        the SOURCE environment variable,
        the INCLUDE environment variable

 If a #INCLUDE file contains further #INCLUDE directives, you may also
 display their contents by using <Ctrl><+>.

 Once finished with a #INCLUDE file you may return the source code window to
 it's original setting by either pressing <.> - full-stop or <Shift><Alt><R>.