Fe fydd clocio ffenest gan ddal y fysell addasu hon yn symud y ffenest (clic chwith), newid maint y ffenest (clic ganol), neu'n dangos y ddewislen ffenest (clic dde). Mynegir yr addasydd fel "lt;Altgt;" neu "lt;Supergt;" er enghraifft.
Clicking a window while holding down this modifier key will move the window (left click), resize the window (middle click), or show the window menu (right click). The left and right operations may be swapped using the "mouse_button_resize" key. Modifier is expressed as "lt;Altgt;" or "lt;Supergt;" for example.