Help understanding Scripting in HTML Viewer Widget?

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Syntax breakdown for {braces}, [brackets], (brackets), :colons:, etc

{something} is a printer template tag. {something:something2} is a printer template tag, drilled-down to a more specific level. Printer Template tags can be read or referenced in many areas of SambaPOS, such as in Rules. For example, {TICKET TOTAL}, {ENTITY NAME:Customer}, or {ENTITY DATA:Customer:Address} can be read in Rules. {:something} is a reference to a value held in a Program Setting (variable) called something … you can create and modify your own variables using Action Update Prog…