Can I somehow make a command like "open the files that were open last
time emacs was used"?

And can I set a command to open for example:
haskell-mode
c:/mypath/haskell/someprogram.hs

?

ssecorp wrote:

Look at Menu Options > Customize Emacs > Specific Option
recentf- tab

The settings I made inserted

'(recentf-max-menu-items 20)
'(recentf-max-saved-items 40)
'(recentf-mode t nil (recentf))

into (Custom-set-variables ...

in my .emacs
There are many recentf options I haven't tried. The defaults seemed
appropriate.

it was a dark and stormy night when ssecorp said,

see Saving Emacs Sessions in the manual:
M-: (info "(emacs)Saving Emacs Sessions")

if i understand the question correctly this should be handled by major modes
M-: (info "(emacs)Major Modes")

ssecorp wrote:

In my .emacs I put

;; ----------------------------------------------
;; *Recentf*
;; Recent files in menu
(require 'recentf)
(recentf-mode t)
(setq recentf-max-saved-items 200)
(global-set-key (kbd "\e\eq") 'recentf-open-files)

If I need file with wich I recently worked I type q and
search by C-s for a needed file.

On 1 Sep 2008, ssecorp wrote:

Also check out the Desktop functionality:

(info "(emacs)Saving Emacs Sessions")

Or:

C-h r m saving e RET