Adobe 65009963 Scripting Manual page 170

JavaScript Reference
Description
The name of the computer on which After Effects is running.
Type
String; read-only.
System osName attribute
s y st e m . osN ame
Description
The name of the operating system on which After Effects is running.
Type
String; read-only.
System osVersion attribute
s y st e m . o s V er s i o n
Description
The version of the current local operating system.
Type
String; read-only.
System userName attribute
s y st e m . u s e r N a m e
Description
The name of the user currently logged on to the system.
Type
String; read-only.
System object
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