3. The method of claim 2 , further comprising: receiving, at the first computer system and from the client computing device, information that indicates that a user of the client computing device has selected the selectable link; executing or interpreting, by the first computer system in response to receiving the information, the code that is stored by the first computer system, wherein the execution or interpretation of the code causes the dynamic content to be generated; and providing, by the first computer system and to the client computing device, at least a portion of the dynamic content.
3. The method of claim 2 , further comprising: receiving, at the first computer system and from the client computing device, information that indicates that a user of the client computing device has selected the selectable link; executing or interpreting, by the first computer system in response to receiving the information, the code that is stored by the first computer system, wherein the execution or interpretation of the code causes the dynamic content to be generated; and providing, by the first computer system and to the client computing device, at least a portion of the dynamic content. 4. The method of claim 3 , wherein: the information identifies user input provided by a user of the client computing device in association with selection of the selectable link; the code is executed or interpreted using the identified user input; and the dynamic content is generated based on the user input.