procedure add64(VAR value1:clunk_type;
		VAR value2:clunk_type;
		VAR sum:clunk_type;
		VAR ids:integer); NONPASCAL;

{ LAST EDIT: 25-OCT-1987 18:29:02 

  This is the external declaration for the Pascal callable routine to return 
  the sum of the addition of two clunk values. This external
  declaration expects that the file 'CLUNK.TYP' has been included at some 
  point before this. Note that a clunk value is represented from [LSW..MSW].

  How it works:
  You need supply two clunk values and it will add them together and return
  the result in sum. The values stored in value1 and value2 are preserved.

  Two valid "ids" statuses are possible:
   1 = success
  -3 = overflow
}