wm iconname

wm iconname window ?newName?

Queries or sets the “icon name” for a particular toplevel window (i.e., the human-readable name to associate with the iconified version of the window). Most modern window managers are perfectly satisifed with using the wm title for this purpose.

?'Fair to say this [L1 ] is only effective under Unix? It seems to be a nop for Windows.