ClickOnce

ClickOnce-deployed applications are considered "low impact", in that they are installed per user, not per machine.

ClickOnce employs Code Access Security (CAS) to prevent system functions being called by a ClickOnce application from the web, ensuring the security of data and the client system in general.

In order to launch a ClickOnce application, a user clicks on its deployment manifest file.

Currently, ClickOnce will only launch if the URL to the deployment manifest is opened using Internet Explorer or Edge.

There is also support for mandatory updates, ensuring that the entire user-base can be moved to a new version in a timely manner.

[3] On 6 May 2009, Microsoft released an update that addressed this problem and also published a support article that helped users manually remove this component.