,
Function[]
Commas are used in separating values in method calls or hard-coded lists and matrices.
{1,2,3,4,5,6}→L1 SetTime(H,M,S)
In the list, each element is separated by a comma. 1 and 2 are both elements. Without the comma between them, it would be treated as one element: 12.
Location[]
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Example[]
:Disp 123 :Pause :Disp 1,2,3
Showing the difference between using commas and not using commas. The first Disp call will display "123". The second one will display 1, 2 and 3 all on different lines.