Its probably that variables defined in AUTOEXEC are "global" scope, i.e. can be referenced in any other batch file, but variables defined within a batch file other than AUTOEXEC only exist within the scope (context) of that batch file. But, I haven't tested this...
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Its probably that variables defined in AUTOEXEC are "global" scope, i.e. can be referenced in any other batch file, but variables defined within a batch file other than AUTOEXEC only exist within the scope (context) of that batch file. But, I haven't tested this...