#!F-adobe-helvetica-medium-r-normal--18*
#!N
#!CDarkGreen #!N #!Rall1053 Persistent outboard modules #!N
#!EC #!N #!N To prevent the executable program of the outboard
module from exiting after each execution, set the PERSISTENT flag on
the FLAGS line in its #!F-adobe-times-bold-r-normal--18* .mdf #!EF file. This setting
may be necessary so that the module can save information from
one execution to another, or because repeated exits and restarts take
too much time. #!N #!N A persistent outboard module is started
from the user interface the first time the module is called
and does not exit until its icon is deleted from the
network (program), the entire network is deleted, or the #!F-adobe-times-bold-r-normal--18* Reset
Server #!EF option is selected from the #!F-adobe-times-bold-r-normal--18* Connection #!EF pull-down
menu. #!N #!N In script mode, persistent outboard modules are loaded
the first time they are called and they do not exit
until the executive exits or the command #!CForestGreen #!N #!N #!F-adobe-courier-bold-r-normal--18*
#!N Executive ("flush dictionary"); #!EF #!N #!N #!EC is run. #!N
#!N Global variables can be safely used to save information between
executions of an outboard module. If the same outboard module occurs
in a network more than once, a different process is started
for each occurrence. #!N #!N Note that the module may not
be called at every execution: If the inputs are changed from
their original values and then back again, Data Explorer saves the
previous results and uses them without recalling the module. The "cache
none" option prevents previous results from being saved, but you also
need to set "cache none" for all downstream modules that process
the outputs. Otherwise, caching at the lower levels will still prevent
the module from being called each time. The SIDE_EFFECT flag specifies
that the module is to be called each time, the performance
penalty being that the module continues to execute even if the
inputs remain unchanged. #!N #!N #!N #!F-adobe-times-medium-i-normal--18* Next Topic #!EF #!N
#!N #!Lall1054,dxall1055 h Modules that can cause executions: #!EL #!N #!F-adobe-times-medium-i-normal--18* #!N
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