Whenever my emacs starts up and the horizontal resolution of the display connected to the computer has changed, that fact is recorded to a file. That file is co

Whenever my emacs starts up and the horizontal resolution of the display connected to the computer has changed, that fact is recorded to a file. That file is consequently a record of when my computer and consequently I arrived at and left my girlfriend's place (because the resolution of the monitor I use there is different from that of the monitor I use at home). I also record the start and end times of any intervals during which I do not interact with my emacs. (I'd rather have a record of intervals during which I don't interact with my puter, but that would prol require me to write a kext.) This is useful for reconstructing when I left home and when I came back, among other things. (One file records only intervals of idleness 49 minutes or longer. Another -- the one I refer to the most -- records intervals 7 minutes or longer. Another, intervals of one minute or longer.)