ps-switch-header

ps-switch-header is a variable defined in `ps-print.el'.
Its value is

duplex

Documentation:
Specify if headers/footers are switched or not.

Valid values are:

nil Never switch headers/footers.

t Always switch headers/footers.

duplex Switch headers/footers only when duplexing is on, that is, when
`ps-spool-duplex' is non-nil.

Any other value is treated as t.

See also `ps-print-header' and `ps-print-footer'.

You can customize this variable.

This variable was introduced, or its default value was changed, in version 20 of Emacs.