A display screen magnifier is controllable by a user to magnify selected portions of a desktop including windows open on the screen. Silica-stabilized alumina powder, prepared by spray drying of bayerite powder, precipitating silica in a bayerite slurry with an acid, or impregnation or co-extrusion of bayerite with sodium silicate solution was found to be a superior catalyst support precursor. The action probability has a location within a region corresponding to an option that in one embodiment can be one of: inaction, automatic action, and engaging the user in a dialog about the user’s desire for automated action, followed by action pending receipt of user approval.