desktop-save

desktop-save is a variable defined in `desktop.el'.
Its value is

ask-if-new

Documentation:
Specifies whether the desktop should be saved when it is killed.
A desktop is killed when the user changes desktop or quits Emacs.
Possible values are:
t -- always save.
ask -- always ask.
ask-if-new -- ask if no desktop file exists, otherwise just save.
ask-if-exists -- ask if desktop file exists, otherwise don't save.
if-exists -- save if desktop file exists, otherwise don't save.
nil -- never save.
The desktop is never saved when `desktop-save-mode' is nil.
The variables `desktop-dirname' and `desktop-base-file-name'
determine where the desktop is saved.

You can customize this variable.

This variable was introduced, or its default value was changed, in version 22.1 of Emacs.