on september 1, 2011 embarcadero released rad studio xe2 (code-named pulsar,) which included delphi xe2, c++builder, embarcadero prism xe2 (version 5.0 later upgraded to xe2.5 version 5.1) which was rebranded from delphi prism and radphp xe2 (version 4.0). delphi xe2 natively supports 64-bit windows (except the starter edition), in addition to the long-supported 32-bit versions, with some backwards compatibility. applications for 64-bit platforms can be compiled, but not tested or run, on the 32-bit platform. the xe2 ide cannot debug 64-bit programs on windows 8 and above. delphi xe2 is supplied with both the vcl, and an alternative library called firemonkey that supports windows, mac os x and the apple iphone, ipod touch and ipad portable devices. firemonkey and vcl are not compatible; one or the other must be used, and older vcl applications cannot use firemonkey unless user interfaces are recreated with firemonkey forms and controls. third parties have published information on how to use firemonkey forms in vcl software, to facilitate gradual migration, but even then vcl and firemonkey controls cannot be used on the same form. embarcadero says that linux operating system support "is being considered for the roadmap", as is android, and that they are "committed to ... firemonkey. ... expect regular and frequent updates to firemonkey". pre-2013 versions only supported ios platform development with xcode 4.2.1 and lower, os x version 10.7 and lower, and ios sdk 4.3 and earlier.