rxvt-unicode (urxvt) is a VT102 terminal emulator for the X window system. Also known a command line emulator.It is found in many versions of Puppy, go to the 'Puppy Menu' then 'Utilities'.
To insert text from the clipboard press 'shift' and 'insert'.
To copy text from Urxvt. Highlight text in Urxvt, switch focus to destination app cursor, then press middle mouse button.