.LP
The pane section (located on the right of the subform) is where 
most actual input of parameter information for a processing program 
takes place.  When a specific program is selected from the guide pane,
the corresponding pane section appears with required and optional
parameters which may be entered/changed/selected for that program.  
.IP "Text Selections" 5
"Text selections" are provided for entering string, integer, and float
values.  Typically
these appear as narrow rectangular boxes in which the required
information is entered by positioning the mouse cursor on the box
and typing in a number.  Typing in a specific number is the same as saying
that the parameter that you entered will be a constant.  Besides 
enterning constants, variables or expressions can be used.  
See the documentation on the expression parser.
.IP "Live Text Selections"
"Live" parameters are indicated by a stylized <cr> arrow that appears to the 
right of the parameter input box.  If the `Responsive Execution' mode is
turned ON, the re-execution of the flow graph is
also initiated by the user entering the required 
value and then hitting the carriage return.
.IP "Sliders   "
For numerical values, optional "sliders" may be used to enter a value
between predefined limits.  To use, position the mouse cursor on
the gray band, hold down the middle button and move the mouse
horizontally, releasing when at the desired level.
.IP "Filenames"
Names for input/output files may be typed in or, or alternately,
selected from a "file browser".  Clicking on a filename prompt will 
bring up a browser window containing a list of files in the current
directory.  A filename may be selected from the browser by
clicking on the desired name.  A different directory may be
accessed either by clicking on a subdirectory name (or ../ to
back up) or by typing it in directly in the space at the
bottom of the browser. 
.IP
Filenames for intermediate results are typically NOT 
typed in, but generated by \fBcantata\fP when the glyphed programs are
connected into a program flow graph.
.IP "Logicals"
Logical values are distinguished by elliptical buttons (if your X server
has shape extensions)
which toggle between two alternate choices when clicked on.  For
example: "Yes/No", "True/False", "On/Off", etc.
.IP "Optional Selections"
"Optional" parameters are prefaced by a small box.  When selected,
the box is highlighted, meaning the parameter value is to be used.
.IP "Toggles and Mutually Exclusive Groups"
Text selections may be grouped together so that only ONE of the
group may be selected at a time.  For "Toggles" one and only one
of the listed options must be selected.  For "Mutually Exclusives"
one of the listed options may be selected or an alternative typed in.
.IP "Action Buttons"
For most situations, it is necessary for the user to enter several
text selections before initiating any action.  In the gather and
execute mode, the user first enters all the required parameters,
then clicks the mouse on an "action button" to register the values
and perform the desired operation.  The `Execute' and `Glyph' buttons are
action buttons in \fBcantata\fP.
