It's going to be difficult to describe the extensive functionality of Lee McDonnell's Point Manager LISP routine in this limited space, but let's get started. First of all, it works with four different object types: AutoCAD points, blocks, polylines (2D or 3D), and external text files. You can import coordinates from text files into the drawing as points, blocks, or polylines. You can also export blocks, points, or polyline coordinates to a text file. That's just some of the functionality; there is much more described in the header of the LISP file.
Load the file, then run the command PTM. A dialog interface is included where you choose the input type and output type, and configure any needed options. There is no DCL file for the dialog, as it is created on the fly, which is a nice touch. The dialog even includes a Help button that downloads an up-to-date PDF help document. Well done, Lee.