Damage from attacks can be sent to other sheets, including those on different devices.
Flechs Sheets (http://sheets.flechs.net) is a cross-platform, networked, record-sheet playing-aid for tabletop BattleTech, designed for tablets. It runs in Safari 11+, Chrome 69+, and Firefox 63+ and can be 'added to your home screen' for full-screen use.
There's limited support for desktops/laptops with HIDPI screens (e.g. 2880x1800+). (Phones are right out.)
This project wouldn't be possible without the .mtf catalog from MegaMek, so cheers to that team forever.
