i am using Mac os and emacs -nw(the terminal mode) i don't know how can i pasta things (having been implemented by M-w in emacs -nw) outside the emacs.

i know that the emacs -ns can do it

Searching from the internet and the command C-h b, i find out that method, but it didn't work out.

(setq x-select-enable-clipboard t)

(setq interprogram-cut-function 'x-select-text)

i don't got to know well about the argument of interprogram-cut-function. Where the x-select-text come from and What it means?

Help me with that.Thanks a lot.