- (NJMapping *)objectAtIndexedSubscript:(NSUInteger)idx;
- (void)addMappingWithContentsOfURL:(NSURL *)url;
- (void)activateMapping:(NJMapping *)mapping;
-- (void)activateMappingForProcess:(NSString *)processName;
+- (void)activateMappingForProcess:(NSRunningApplication *)app;
- (void)save;
- (void)load;