You can enter points from the keyboard either in absolute or relative coordinate values. You can enter coordinates in either rectangular (x,y) or polar (distance/angle) mode. You can change the mode in the middle of a command.
If you want to enter all coordinates in relative values, change the input mode to relative. The program will then automatically handle entered points as relative points (coordinate values relative to previous entered point). Basically this means that you do not need to enter the character @ in front of the coordinates of a point when you want to enter relative points.
You can set relative input on or off by changing the system variable RELATIVEINPUT to value 1. When relative input mode is on, the program handles all entered points as relative points. Then for example entering 50,0 means a point 50 drawing units horizontally from the previous entered point, not from the origin.
Note: The value of the RELATIVEINPUT system variable is stored in the CADS.INI file, so if you exit the program with the input mode set to relative, it will be relative when you restart the program.