Dollar sign and brackets?

[tsepper]

In looking over a plugin (eauthorize), I noticed the following in a script step:

GetAsNumber (${Authnet - Auth-Capture}::gt_plugin_result) =1 and ${Authnet - Auth-Capture}::td_result_response_code = 1

Now, I realize the /* */ comment out the line.. but I've never come across the ${} before. Can someone shed some light on this for me?

[comment]

See FM Help > Creating a database > Working with formulas and functions > Using a reserved word or symbol for a field or table name.

[tsepper]

Interesting. So it's safe to remove those ${} if I'm sure I'm not using reserved words, etc.

Thank you.

[comment]

If you're sure, yes.