These AutoLISP functions all start with 'C'.
Returns the third element of a list
Returns the second element of a list
Returns the first element of a list
Returns a list containing all but the first element of the specified list
Converts an integer representing an ASCII character code into a single-character string
Associates application-managed data with a dialog box tile
Closes an open file
Executes an AutoCAD command
Executes an AutoCAD command and the supplied input
Serves as the primary conditional function for AutoLISP
Adds an element to the beginning of a list, or constructs a dotted list
Returns the cosine of an angle expressed in radians
Converts a value from one unit of measurement to another