KB00087 - Caffeine adds 8~ to Cygwin and Putty windows

Cygwin and Putty display the digit 8 followed by the tilde character when Caffeine does its thing.

This is how terminal emulators display the faked F15 keypress which Caffeine generates. If you find it's annoying, you might like to launch Caffeine with the -useshift command line parameter.

For most users, F15 is the less intrusive keypress, but for those using a terminal emulator, shift might be a better choice.