The procedure to run sap90p in a DOS window under NT is the same as given above for sap90 except one substitutes the word sap90p for sap90 in all locations. Apparently in the recent reload of NT machines the p:\start directory has been left out of the path therefore the modified procedure to run sap90 in a DOS window under NT is given below. In the explanation it is assumed that the data file is called "frame" and my comments are in parentheses(), everything else should be typed as listed. c: cd c:\user p:\start\start sap90 (to add p:\sap90 to path) sap90 frame (to run sap90 with data in frame file) go (to perform calculations) (Preview results and print using a Word or Notepad, you cannot print from the DOS window.) finish (to remove p:\sap90 from path) If you wish to check the program operation with a known file insert the command copy p:\sap90\frame between the p:\start\start command and the sap90 frame command.