|FROG DRAW 3||
FROG Draw 3 (FD3 for short) is a mouse-driven package for the creation of|
chemical process flow diagrams.||
KEY TERMS||
FD3 provides instructions at each step of the flow diagram creation process 
to|help make things as easy as possible for the beginning user.  In order for 
these|instruction to be effective, one must first understand the definitions 
of a few key|terms.||
o Module||
A module is a unit in a chemical process.  Examples of modules are mixers,|
separators, evaporators, and pumps.  FD3 includes several pre-defined modules|
but is also capable of using user-defined modules.||
o Module Body||
A module's body is the picture which FD3 draws to represent that module.  
Every|module has a body.||
o Module Label||
A label is normally placed on top of a module's body so that the module may 
be|easily identified.  Not all modules have labels.  When modules are moved 
or|deleted, so are their labels.||
o Stream||
A stream is roughly equivalent to a pipe in a chemical plant.  It is used to|
connect two modules.  In FD3, a stream MUST start on one module and end on|
another module.  Two special "modules" called Feed Arrow and Product Arrow|
are included so that streams which enter or exit the process may be drawn.  
When|one of the modules to which a stream is connected is moved or deleted, 
that|stream is also moved or deleted.  Every stream has an arrow to indicate 
its|direction of flow.||
o Stream Label||
Like modules, streams also have labels for indentification.  These labels|
must be numbers.  When streams are moved or deleted, so are their labels.||
A stream label may also be a list of numbers separated by commas or colons|
(but not spaces).  This ability is useful when using FD3 in conjunction with|
Rice University's material & energy balance software.  The following stream|
labels are valid:||
    1:3|
    4,5|
    3,4,5||
Lists of stream numbers may also be enclosed in brackets:||
    [4:6]|
    [1,2,3]||
o Text||
FD3 also has the ability to insert free text which is not associated with any|
module or stream.  Such text is simply referred to as "text" or a "text 
object."||
o Box||
FD3 includes the ability to highlight portions of the flow diagram by 
enclosing|those sections in boxes.  Streams CANNOT be connected to these 
boxes.||
DIALOG BOXES||
One special note must be made about FD3 dialog boxes.  Whenever a dialog box|
appears and asks you to enter information, you must click on the DONE button|
when you are finished typing.  The RETURN key cannot be used to close a|
dialog box.||
ORDER OF OPERATIONS||
Unlike most mouse-driven programs, FD3 requires that you select the action 
you|wish to perform and then select the object on which you wish to perform 
that action.|This order of operations was chosen because it allows FD3 to 
give users|step-by-step instructions for every operation.|