As mentioned above, you can find out more and also see examples of these commands in the HELP files in Maple. See if you can reproduce versions of the graphs in the text in sections 1.1 and 2.1. Hopefully, the graph looks more like the combination of sine and cosine that it should. R-K method is used. To call higher order R-K methods is a bit different from this.
More information is available via the on-line help in Maple.