The System Tags are status Tags that Ignition provides about the Client and the Gateway. You cannot create any new Tags in the Client or Gateway scoped folders. The Tag names and folder structure are managed by the Ignition Gateway. However, you can modify Gateway-scoped Tags to perform alarming, history, and scaling. You cannot modify Client-scoped Tags.
Client-scoped Tags provide status information about the client's system. Every individual client is going to have their own values like IP address, hosting name, username, etc,.
Gateway-scoped Tags provide status information about the Gateway like alarming, database, throughput, memory usage, performance of the server, and much more.
The Client Tags, as the name implies, are only available for use in Clients. They are scoped at the client level unlike the Gateway Executed Tags. All clients will have the same client Tags, however, the actual values are unique and independent of each other. In other words, even though client Tags are created in the Designer, each client will create their own instances. This makes them very useful as in-project variables, for passing information between screens, and between other parts of the clients, such as scripting.
Client Tags are a hybrid of memory, expression, and SQL Query Tags and do not have a scan class. When set to run as an expression or query, a poll rate is specified dictating how often the value should be calculated.
Client Tags support datasets in addition to all the other datatypes such as integers and date-times.