.LP
The EXPRESSION is used to evaluate an expression or series of
expressions at a certain point in the network.  When the input connection
becomes active, the expression contained in the text area labeled "Enter
Expression:" is evaluated.  The input connection data is then propagated to
the output filename.  The rest of the network connected to the glyph's output
connection will then be active for scheduling and dispatching.
.LP
The expression glyph provides a convenient way to re-initialize variables
during a while loop,  initialize variables prior to the execution of a
network, or set new variables at any point in a network.
..SH
Special Thanks To:
.LP
Mathew Yeates of NASA (JPL Division) for donating the EXPRESSION glyph to
cantata.
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