		----------------	----------------		         ----------------		----------------
		|		|	|		|<--------------.------->|		|<------------->|		|
		|		|	|		|		|        |    		|		|		|
	------->|   HELP	|<----->|     MAIN	|		|        |     I/O	|		|     CDM	|<------|
	|	|		|	|		|		|        |     		|<-------|	|		|	|
	|	|		|	|		|		|        |     		|	 |	|		|	|
	|	----------------	----------------		|        ----------------	 |	-----------------	|
        |                                 ^  ^  ^                 	|				 |				|
        |                                 |  |  |                 	|				 |				|
        |               ------------------|  |  |                	|				 |				|
        |               |		     |	|                       |                		 |				|
        |               |           ---------|  |                	|				 |				|
        |               |           |           |                	|				 |				|
        |               v           |           v                	|				 |				|
	|	----------------    |	----------------		|	----------------	 |	----------------	|	-----------------
	|	|		|   |	|		|		|	|      		|	 |	|		|	|	|		 |
	|	|		|   |	|		|		|	|      		|	 |	|		|	|	|		 |
	|	|     CLI	|   |	|     E E	|<------|	|------>|      E H 	|<----|	 |	|      CRT	|<------.------>|      DISK	 |
	|	|		|   |	|		|	|	|	|      		|     |  |	|		|	|	|		 |
	|	|		|   |	|		|	|	|	|      		|     |  |	|		|	|	|		 |
	|	----------------    |	----------------	|	|	----------------      |  |	-----------------	|	------------------
	|			    |		|		|	|			      |  |				|
        |                           |           |               |	|			      |  |				|
        |                           |           |               |	|			      |  |				|
        |                           |           |               |	|			      |  |				|
        |                           |           |               |	|			      |  |				|
        |                           |           |               |	|			      |  |				|
        |                           |           |               |	|			      |  |				|
        |                           |           |               |	|			      |  |				|
        |                           |           |               |	|			      |  |				|
        |                           |           |               |	|			      |  |				|
        |                           |           |               |	|			      |  |	        		|
        |        		    |		|	 	|	|	----------------      |  |	----------------	|
  	|   	 	  	    |		|	       	|	|	|		|     |  |	|		|	|
      	|	 		    |	     	|		|	|	|		|     |  |	|		|	|
 	|	 	|-----------|		|		|	|------>|     CALC	|<-|  |  |	|     PRNT	|<------|
 	|	 	|			|		|	|	|      		|  |  |  |	|		|	|
 	|	 	|			|		|	|	|      		|  |  |  |	|		|	|
        |      		|			|		|	|	----------------   |  |  |	-----------------	|
        |               |                       |               |	|			   |  |  |				|
	|		|			|		|	|			   |  |  |				|
	|		|			|		|	|			   |  |  |				|
	|		|			|		|	|			   |  |  |				|
	|		|			|		|	|			   |  |  |				|
	|		|			|		|	|			   |  |  |				|
	|		|			|		|	|			   |  |  |				|
	|		|			|		|	|			   |  |  |				|
	|		|			|		|	|			   |  |  |				|
	|		|			|		|	|			   |  |  |				|
	|		v			v		|	|			   |  |  |				|
	|	-----------------	-----------------	|	|	----------------   |  |  |	----------------	|
	|	|		|	|		|	|	|	|		|  |  |	 |	|		|	|
	|	|     DATA	|	|		|	|	|	|		|  |  |  |	|		|	|
	|	|    HANDLER	|	|   F P  DEC	|	|	|------>|     DISP	|  |  |  |	|      KBD	|<------|
	|	|		|	|		|	|		|		|  |  |  |	|		|
	|	|		|	|		|	|		|		|  |  |  |	|		|
	|	-----------------	-----------------	|		----------------   |  |  |	----------------
	|		^			^		|			^	   |  |  |
	|		|			|		|			|	   |  |  |
	|		|			|		|			|	   |  |  |
	|		|			|		|			|	   |  |  |
	|		|			|		|			|	   |  |  |
	|		|			|		|			|	   |  |  |
	|     		v			v		v			v	   v  v  v
	|	-----------------------------------------------------------------------------------------------------------------------------
	|	|															    |			
	|	|															    |	
	|	|															    |
        |------>|						DATA STRUCTURE								    |	
		|															    |			
		|															    |											
		|															    |	
		-----------------------------------------------------------------------------------------------------------------------------