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• variables have a dedicated prefix like bamboo.custom.aws.*, with * being a task specific prefix, e.g. bamboo.custom.aws.cfncloudformation.stack
• variables refering referring to a collection of resources provide their ids in a semicolon separated list (i.e. the same format available on input), e.g. ${bamboo.custom.aws.ec2.image.resources} with values ami-985b21f1;ami-9a5b21f3
• you can refer to these variables from subsequent tasks via something like ${bamboo.custom.aws.cfn.stack.sampleStackOutputKey}
• these variables are also available as environment variables in the Script Task for example, albeit named slightly different, e.g. $bamboo_custom_aws_cfn_stack_StringWithRegex (Unix) or %bamboo_custom_aws_cfn_stack_StringWithRegex% (Windows)

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