Combination of line plots and point plots

hi bill and all the others,

i wonder if i really can't combine two functions (lets say f,g: R -> R) in a
plot, with one of them beeing display as a line and the other as points in
the coordinate system.
up to now i didn't really try, but the fact that i can change the way data
is displayed only (?) by calling methods on the GraphicsModeControl object
of the display i added the (data)referneces to makes it seem so, or is there
a way?
i also would like to combine line plots with histograms, is it possible if
both data sets have the same y-axis mapping (and how) ?