RBScript
RBScript is a scripting language which is similar to, and shares many features with, REALbasic. They are both object oriented, support modules and use almost identical datatypes (REALBasic introduced some differences in the latest version, mainly for compatibility with some C APIs). RBScript is mainly used to script applications written with REALbasic, and (from the 2006r1 version) is also used in the REALbasic IDE.
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