Emacs: check for no-window-system in .emacs

is it possible, to check if开发者_开发知识库 emacs is running in --no-window-system (-nw) mode within the dot-emacs file (.emacs)? I would like to enable/include certain extension only if emacs is in window mode (/or not).

Kind regards, mefiX

The variable window-system is nil if the selected frame is on a text-only terminal.

Put the code you want to run when emacs executes in a windowed environment inside a when block and use the display-graphic-p predicate i.e.

(when (display-graphic-p)
  (do something)
  (do-another-thing))

or reverse