0 software that tries to make users buy a program, service, etc. by making pop-ups (= small screens that you need to click on to close) appear regularly on their computer screens --
Feature-limited is merely one mechanism for marketing shareware as a damaged good; others are time-limited, usage-limited, capacity-limited, nagware and output-limited.
Some nagware keeps the message up for a certain time period, forcing the user to wait to continue to use the program.
It attempts to persuade users to buy the software by displaying ads and other nagware.
