What the difference between "click" and "press" in event?

Hello! 

I am a freshman,i want to know what the difference between "click" and "press" in event?  And "release", "activate" ?   

Thanks a lot for you help!

Hello bobo2015,

here is the page in the WinCC Advanced manual, where you can look up the description of every event:
https://support.industry.siemens.com/cs/ww/en/view/109091876/57251616395
What events are available depends on the control / object type and the HMI device.

An because I'm nice today:

• Press
  Occurs when the user clicks on a button with the left mouse button, presses <RETURN> or <SPACE>. Also occurs when the user right-clicks on an object of the symbol library.
• Click
  Occurs if the user clicks a display and operating object with the mouse or touches the touch display with a finger.
  In case you click the incorrect object, prevent processing of configured function list as follows:
  • Move the mouse pointer away from the object while keeping the mouse button pressed. Release the mouse button as soon as the mouse pointer leaves the object. The function list will then not be processed.
  • On touch displays, the display must be touched with the finger until a reaction occurs, e.g., a screen change.
• Release
  Occurs when the user releases a button.
  This even does not occur, as long as the button remains pressed.
• Activate
  Occurs when the user selects a display or operating object using the configured tab sequence
  Note                
  If the user e.g. clicks a button with the mouse, the "Click" event is triggered. Users wishing to trigger the "Enable" event must select the button using the tab key.
  The "Enable" event is only used to detect whether an object was selected. The event does not trigger a password prompt. For this reason, do not use the "Enable" event if you want to configure access protection on the function call of the object.