How to Find Out Who Has Opened a Form

Is there a way to find out who has opened a form? we have multiple assignees for a form in assignment tab, Can we find out who has opened the form from the load event of the form? I tried to get the value of "tp!owner", it didnt give me any value.
Can anyone please help...

OriginalPostID-104624

OriginalPostID-104624

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