[JonChesterfield]

Basically swap what program is in the foreground on one screen at the same point you'd otherwise look at a different screen. Alt tab or whatever the keyboard shortcut is to see the docs, then again to go back to the editor.

It's slower and it's worse, but I write a fair amount of code on a laptop in hotel rooms and it works well enough. Most annoying things are probably the loss of scrolling test output on the second screen and difficulty doing multiway diff compares.