void set_skip_pager_hint(bool skip);

If the window shall not be shown in the pager.

A pager is a program showing the contents (windows) of each virtual desktop, in small scale, to help the user get an overview of all the desktops and its open applications.

Users of Microsoft Windows rarely have multiple desktops and probably don't care about this setting.

See also: get_skip_pager_hint()