Cases marked as “viewed” will appear to be visited links in the FogBugz UI.
Customer Facing Information.
To mark or unmark a case as viewed, send cmd=view. The available arguments are:
ixBug – required.
If supplied will only mark case as being “viewed” up until this bugevent. If omitted, will mark case as being viewed up to the latest bugevent. To mark a case as unread, use ixBugEvent=1..
See also the full XML API documentation.