Is it possible, to have alarms come in and be acknowledge by one vision client, but remain unacknowledged to other vision clients.
Perhaps the use of multiple Journals?
No. In Ignition, an alarm is a global object that can be in the four derived states from two conditions:
Active or not active
Acknowledged or not acknowledged
If you want to do some per-user notification/acknowledgement system, you'll have to implement it yourself.