Is there a limit to the file size in KeyNote? Or to the number of notes and tree nodes in one file?
Any such limits are only imposed by the amount of memory you have and the version of Windows you use. There are no hard-coded limits anywhere in KeyNote; how much a file can hold only depends on the amount of memory you have and, to a degree, the version of Windows. Text is stored in lists; a Delphi list can hold a maximum of 134.217.727 items, which theoretically limits the number of lines you can have in a single note, but your computer will probably run out of memory long before this number of lines is reached. (There is no limit on the length of a single line.) In general, KeyNote can easily handle files up to 5-10 megabytes in size. Beyond that, some operations (opening and saving files, searching, etc) may become too slow to use the program comfortably. Remember that KeyNote is a notepad, not a database, and has not been designed to handle huge amounts of data. As for the tree, it will become a bit sluggish when refreshing thousands of nodes, but that’s only a speed (CPU) issue.
