you have 2 pretty simple ways...
1) instead of csv use ini-file with which you can easily check if it's there.
and you can even write it again and again and still there will be only one entry, the newist.
2) you can shell to command-prompt and with find and @error you can check if there is already data for that wksta on the file.
this is not recommended way as you have no easy way of knowing how old the data in the file is etc...
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