When @code{zmacs-regions} is non-@code{nil} (this is the default), the
concept of an @dfn{active region} exists. The region is active when the
corresponding mark is active. Note that only one active region at a
When @code{zmacs-regions} is non-@code{nil} (this is the default), the
concept of an @dfn{active region} exists. The region is active when the
corresponding mark is active. Note that only one active region at a