CoreServices is a set of generally useful (that is, for general use) low-level APIs that sit underneath (and therefore can be used by) both [http://www.trimasjaya.com/products/railing_tangga/index.html Railing Tangga]

[http://www.trimasjaya.com/pintu-dan-jendela/index.html Pintu dan Jendela]

[http://www.pintuvariasi.com Pintu Aluminium] and Cocoa:

See also ApplicationServices and CoreFoundation.