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Is there a general program, that start my GUI program, and able to specify the size and location of this program ? Not just X programs, but also other GUI libs.
Devil's Pie does have such an option. See e.g. the Ubuntu wiki and this howto. In X11 parlance, a window's size and location make up its geometry. Write something like
(if (is (application_name) "Foo")
Required, but never shown