larswm iconifies windows by hiding them. To unhide a hidden window, you must first locate its label using the status bar. Please see the section called Status Bar Mouse Functions in Chapter 5 for information on how this works.
You can move a window between desktops by hiding it, changing desktop, and then unhiding the window again. You cannot move windows between screens this way, because X11 does not support it.
The best way to use the window hiding feature is through keyboard shortcuts. You can hide the focused window and unhide the last hidden window without using the mouse at all. This makes for a quick way to move a window from one virtual desktop to another.