Documentation here explains how IRIS Portal can be launched in a tab in the VS Code editing area from Server Manager. One limitation though is that if you then perform an action in Portal which needs to invoke a modal message box in the browser (e.g. window.alert() or window.confirm()) this doesn't work.
I created this issue on the VS Code repository requesting a change that will unblock this. The issue needs more evidence of community support within the next week if it is to stand a chance of progressing.
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