Emulating X11 selections on Windows

Putty

Putty can emulate the Xterm copy/paste style. It is not the default but it can easily activated

Emacs

In Emacs it is a bit more complicated. The following definitions are required in the .emacs file:

(setq select-active-regions nil)
(setq mouse-drag-copy-region t)
(global-set-key [mouse-2] 'mouse-yank-at-click)

Firefox

In Firefox the paste style can be activated in about:config. Search for "middle" and set middlemouse.paste to true.

In order to copy the selected text to the clipboard it is necessary to install an extension. AutoCopy 2 does the job.