most is in input.h
NKRD (4000) is largest number of input lines

maximum line length is
INPUT_LINE_LENGTH is set to 200 in cddefines.h

cdRead routine to read in command lines and enter into command stack 
 called by user when cloudy used as subroutine 
 called by maincl when used as a routine

certain starting characters say that a line should be totally ignored - this logic
occurs in cdRead

end-of-like sentinals 

input_readarray is used to bring up the next command line image in the stack

GetQuote get string within quotes, then clear the quotes
GetQuote( chDestination , chOrigin );

comment lines - entire line is a comment if it starts with certain special
symbols.  This is