SOURCE Environment Variable
 Notifies MrDebug where to find source code
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 The SOURCE environment variable points to one or more directories that
 contain the source code for your application. SOURCE is very similar to the
 standard PATH environment variable - MrDebug will search the directories
 contained within the variable for the source code files that cannot be found
 within the current directory.

 The following example shows an example of how to set up your SOURCE
 environment variable:

    SET SOURCE=C:\CLIPPER5\SOURCE\MYAPP;C:\CLIPPER5\SOURCE\MOREAPP;

 In the above example, MrDebug will search the two directories if no source
 files can be found within the current directory.

 Don't forget to separate directory entries with a semi-colon (';'). And use
 no spaces.

 These paths are searched after any paths entered in the 'Path for source'
 option under the options menu.