property pCreatorCode : "OOut"

tell application id "com.apple.systemevents"
	try
		set procOO to first process where creator type is pCreatorCode
	on error
		display dialog "OmniOutliner is not running"
		return
	end try
	set strName to name of procOO
end tell

set strScript to "
script
	on CountRows()
		tell application " & quote & strName & quote & "
			if count of documents > 0 then
				tell front document
					set strMsg to \"Number of rows in \" & name as string & \" is \" & (count of rows) as string
					display dialog strMsg
				end tell
			end if
		end tell
	end CountRows
end script
"
set oScript to run script strScript
CountRows() of oScript