The ggraphics() constructor of the gWidgets package opens a plot window. Is it possible to open several plot windows and to control in which window we plot a graph ? (The help of ggraphics() says: When multiple graphics devices are present, clicking in the window of one will make that the current device. But I want to control the current device with the R code, not with the mouse)
You can have multiple ggraphics instances, each having its own device number to do all the things you want. The ggraphicsnotebook widget packages up an interface for this if you want. The bit about clicking on the window is in addition to the usual programmatic ways to specify the current device.