A type of shareware that frequently disrupts normal program operation to display requests for payment to the author in return for the ability to disable the request messages. (Also called nagware) The requests generally require user action to acknowledge the message before normal operation is resumed and are often tied to the most frequently used features of the software. See also careware, charityware, crippleware, freeware, FRS, guiltware, postcardware, and -ware; compare payware.