Developing apps that talk to one another

New York

NAVIGATING the Internet used to mean painstakingly typing the exact address that you wanted into your computer. The Web browser and the search engine simplified that, giving us the Internet that we take for granted today.

Now, across Silicon Valley, companies from tiny start-ups to titans such as Google and Facebook are trying to bring the same simplicity to smartphones by teaching apps to talk to one another.

Unlike Web pages, mobile apps do not have links. They do not have Web addresses. They live in worlds by themselves, largely cut off from one another and the broader Internet. And so it is much harder to share the information found on them.

It is not just a matter of consumer convenience. For Google and Facebook, and any company that has built its business on the Web, it is a matter of controlling the next entr…