As a result, two clients connected to the same server can use the same identifier to refer to the same resource. For example, if a client creates a window of identifier codice_14 and passes this number codice_14 to another application (via any available means, for example by storing this number in a file that is also accessible to the other application), this other application is able to operate on the very same window. This possibility is for example exploited by the X Window version of Ghostview: this program creates a subwindow, storing its identifier in an environment variable, and calls Ghostscript; this program draws the content of the PostScript file to show in this window.