The DER_DBG_CASESENSITIVE environment variable, if set to a non-null value (for example, "yes", 1, "true", etc.) tells the debugger to compare part names and module names on a case-sensitive basis. By default the debugger converts all names to uppercase for comparison purposes. Note that this does not affect filesystem accesses which are operating system dependent and not affected by DER_DBG_CASESENSITIVE.