.LP
The SWITCH is used to switch between two input data connections.
When the glyph is executed, one of the two input filenames will be passed 
to the output filename, based on the evaluation of a conditional expression.  
If the conditional expression evaluates to a non-zero value, then the first
input is sent to the output;  otherwise, the second input is sent to the output.
The rest of the network connected to the glyph's output connection will 
then be active for scheduling and dispatching.
.LP
It is assumed that both of the two input connections will be 
valid before the evaluation is performed.  If desired, an optional trigger
input may be connected so that the conditional expression is not evaluated
and the appropriate input is not selected until another procedure or network
is finished executing.
.SH
Special Thanks To:
.LP
Mathew Yeates of NASA (JPL Division) for donating the SWITCH glyph to 
cantata.
