Several NeXT executives replaced their Apple counterparts when Steve Jobs restructured the company's board of directors. Over the next five years the NeXTSTEP operating system was ported to the PowerPC architecture. At the same time, an Intel port and OpenStep Enterprise toolkit for Windows were both produced. That operating system is code named Rhapsody, while the crossplatform toolkit is called "Yellow Box". For backward compatibility Apple added the "Blue Box" to Rhapsody, allowing existing Mac applications to be run in a self-contained cooperative multitasking environment.