To input coordinates from a graph plotted with AUTOGRAPH, use the call
X, Y (real) are user (i.e. data) coordinates. Their value when the call is made is used to preset the cursor position (if this is possible on the GKS workstation concerned). On exit, they are set to the position indicated by the cursor input operation. The integer N is the SGS choice, and will generally indicate the button that has been pressed.
Variations of choice device, cursor visibility, echo type, etc., may be made by direct SGS/GKS calls before SNX_CURS is called.
Appendix E contains a demonstration program for SNX_CURS.