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Display an alert window that contains a specified message and an OK button for dismissing the window.
showAlert(message, title="Alert", icon="warning")
message to display in alert window
title of alert window
icon to display in alert window; options are "error", "info", "question", or "warning".
"error"
"info"
"question"
"warning"
getYes
# NOT RUN { local(envir=.PBSmodEnv,expr={ showAlert("Hello World!") }) # }
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