Verfahren zur Herstellung von wässrigen Beschichtungszusammensetzungen

摘要

An amusement system comprises a keyboard (5) having a plurality of keys (50 ... 50) and a main control portion (2) capable of instructing operation of the keyboard (5) through a predetermined display device (11), an operation instructive portion (11) at which a plurality of regions (120A to 120I) associated with the user's fingers are provided in a visually identifiable mode is displayed on a screen of a display device (11). An instructive mark (130) for specifying a key (50) to be operated by the finger associated with each region is displayed in the regions (120A to 120I), respectively. The instructive mark (130) and a predetermined reference mark (123) are scrolled relatively in a predetermined direction, and the operation time of the key (50) specified by each instructive mark (130) is indicated based on a positional relationship between the instructive mark (130) and the reference mark (123).