One way to work around this is to write programs that work in memory and have a button that manually triggers side effects So you do all your manipulations and

One way to work around this is to write programs that work in memory and have a button that manually triggers side effects So you do all your manipulations and then hit a "Save" button at the bottom which triggers the save to disk. Similarly if your input depends on a side effect (web resource?) You place a button on the top which will "start" your program. Of course, the programming environment can offer primatives (debouncing and the like) to help make this stuff easier.