# How can I programmatically specify the positioning of a window at the time of its creation?

CreateDocument[{}, WindowSize -> {100, 100}]


always centers the new window.

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HammingWindow[t-position] – Rojo Jul 13 '14 at 3:49
@Rojo German pun: I'm the viper. I've come to vipe your vindows. – Jens Jul 13 '14 at 4:06
related – Kuba Jul 13 '14 at 7:08

To make the offset from the top left corner of the screen 10 down and 100 to the right, do this:
CreateDocument[{}, WindowSize -> {100, 100},