I've created script in Python for ArcGIS that simplify Line, and make buffer from processed line.
input = "input.shp"
name = "bord"
buffer = "buffer.shp"
gp.SimplifyLine_management(name, input, "POINT_REMOVE", "2000 Meters", "FLAG_ERRORS", "NO_KEEP", "NO_CHECK")
gp.Buffer_analysis(input, buffer, "10 Meters", "FULL", "ROUND", "NONE", "")
but it this case, I have to create 2 shapefiles (one for intermediate results, and one for output). But is it possible to save for ex. intermediate results to variable, and then use it as parameter for buffer, and print out geometry of buffer(as array of vertexes) to the screen? I'm using ArcGIS 9.3