how to add username to file name on save

hi, i would like to add the username that the user is logged in as when the file is saved.
that is the network username.

can anyone tell me how to do this using vba?
for example if user sa1b was saving a file is called "Data.xls" the new filename would be
"sa1b - Data.xls"

many thanks

try

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thank you, that is just what i needed.