Optional
arg1: anyFirst argument that is passed from caller.
Optional
arg2: anySecond argument that is passed from caller.
Optional
arg3: anyThird argument that is passed from caller.
Optional
arg4: anyFourth argument that is passed from caller.
Optional
arg5: anyFifth argument that is passed from caller.
Optional
arg6: anySixth argument that is passed from caller.
Optional
arg7: anySeventh argument that is passed from caller.
Optional
arg8: anyEighth argument that is passed from caller.
Callback used by Events and EventHandle functions. Note the callback is limited to 8 arguments.