On the current state i meanwhile found this:
http://manual.zorro-project.com/trading.htm - Trade status, chart and trade log
I think a button on the interface to open that would be nice.
I also learned that Zorro should save a copy of its current state on disk to resume... but is there a mechanism to verify the absolute numbers in some interval to counter discrepancies due to automatic execution on broker side (stop loss, take profit, margin, product expiry) or failure to execute ? Is accumulation of differences avoided ?