Sometimes you want to have a piece of code be called periodically. Register a ~timeout~ function, and the main loop will call it after the specified time has elapsed. If you want to stop being called, return %FALSE% from the function. ]]> If you want to monitor a socket, pipe, or a file for data available for reading or writing, you can do it with %gtk::input_add()% function. Pass it the resource to be watched, the input condition, and the callback with optional data. ]]>