Server Client Process Status

Using Citect 2018 R2 + update 7, I need to determine if the client process of my servers is active or inactive. I'm determining the equivalent status for all IO, Trend and Alarm server processes by using ServerIsOnline(), but I don't think this can be used for the client process?

So instead I'm trying to set a variable tag within the client process startup function then use the value of this tag to determine active/inactive, but this is proving problematic I think due to the timing of processes starting up?

Can anyone suggest a cleaner way of deriving if a server CLIENT process is active (running) or not.

Thanks