Get username in trigger not running a Windows process

[guido]

Hello,
we have several windows 2008 R2 RDP servers with users who are using excel.

We monitor a server (active checks) with 10 Excel users on it and if the server is
running less or more then 10 times the Excel processes we get trigger alarm in Zabbix.

trigger: {excel 10xroc.num["excel.exe"].last(0)}#10

Everything is working fine but:

We want to get the username who are NOT running Excel...
Now we must login to the RDP server to check which user are NOT running the excel process.

Does someone know how to get the username from the server in this trigger?

Regards