You can’t copy and paste across two computers, so here is a hack, moreso here is a space to do it.
Make your own URL, here’s mine
I made this URL, by typing “john” at the end of this http://cl1p.net/
Paste some text in it and save
When you are on another computer launch to this URL and click copy, then paste it where you want.
Next time, just clear the screen and start again…you always re-use the same space
You can also load in attachments.