QPAC2 uses a Button Frame which is normally situated across the top of the screen. The command WM sets up the three basic windows #0, #1 and #2 so that there is space for two rows of buttons. At the same time, the window attributes are reset to the status they would have been in had you reset the system and pressed <F1> for monitor mode. The current screen resolution mode is not affected.
QPAC2 and the Pointer Environment are not necessary to use WM.