This method tells a gadget to send an OM_UPDATE message to its target
object.  Boopsi gadgets have a function similar to icclass objects--each
gadget can have an ICA_TARGET and ICA_MAP in order to notify some target
object of attribute changes.  When a Boopsi gadget sends an OM_NOTIFY
message, it always includes its GA_ID.  This makes it easy for an
application to tell which gadget initially sent the OM_NOTIFY.  See the
description of icclass's OM_NOTIFY and OM_UPDATE and the rootclass's
OM_NOTIFY and OM_UPDATE methods for more details.

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