By adding or swapping a logical primitive here or there, the entire functionality of the program shifts or enlarges.

通过在任意一个地方增加或交换一个逻辑基元，整个程序的功能性质都会[产生]转变或[得到]扩展。

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Napster, the most popular music-swapping program, has amassed 10m users worldwide within ten months of its launch.

ECONOMIST: Napster��s wake-up call

In addition to purchasing mortgage-backed securities, the committee said Operation Twist, the bond swapping program, will be extended through the end of the year and its forward guidance through 2015.

FORBES: With QE3, How Low Will Mortgage Rates Go?