To understand xargs better

Question

I want to understand the use of xargs man in Rampion\'s code:

screen -t man /bin/sh -c \'xargs man || read\'

Thanks to Ram

Answer 1

xargs gathers arguments from stdin and executes the command given with those arguments.

so cat is waiting for something to be typed, and then xargs is running man with that input.

xargs is useful if you have a lot of files to process, I often use it with output from find. xargs will stuff as many arguments as it can onto the command line.
It's great for doing something like

find . -name '*.o' -print | xargs rm