What is an example of something today to illustrate Charles Peirce's definition of pragmatism, which considers practical consequences or real effects to be vital components of both meaning and truth?

Charles Peirce believed that a statement has to have practical applications to be meaningful. He stated that we must consider the practical effects of a conception to understand an idea.
For example, the source in the links below is about a hotel attendant who handed a guest an object that looked very much like a key but that the attendant said was not a key. The guest used the object to open the door, and it worked. However, the attendant referred to key-like objects that did not open the door as keys and did not refer to the one key that worked as a key. As the writer points out, perhaps the attendant had earlier knowledge about what a key was (perhaps an earlier set of keys that no longer worked) and therefore did not identify this new object as a key. However, as we define objects or concepts by their practical applications, the object the guest used to open a door is in fact a key. Therefore, our notion of what something is is defined by what it does or its effects. 
http://www.digitalpeirce.fee.unicamp.br/p-prabur.htm