Delete rows with duplicate field...

thanks for your effort.
to be more precise:

ID , OS, time and many more are the columns.
each entry is a row.

when I do:
x <- unique(dataset$ID)

It just gives me a list of all IDs (levels).

I want to get a dataframe where just one entry (row) for each ID is
included...

like:
userA , Win, 12:22
userA, OSX, 23:22
userB, Win, 04:44

should only give me row 1 and row 3...

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