Select Edit»Sequence File Callbacks to launch the Select Sequence File Callbacks dialog box, which lists every callback sequence you can override in the sequence file. The columns in the list display the name of the callback and indicate whether the callback is an Engine or Model callback. For each callback, select or clear the checkbox to add or remove it from the sequence file.

The following restrictions apply to the SequenceFileLoad and SequenceFileUnload callbacks:

• TestStand may hang when it executes a SequenceFileLoad callback that calls into another sequence file which contains a SequenceFileLoad callback that calls back into the original sequence file. This can occur with any number of levels of sequence files as long as the dependencies among the SequenceFileLoad callbacks exist between sequence files.
• TestStand may enter an infinite loop when it executes a SequenceFileUnload callback that calls into another sequence file which contains a SequenceFileUnload callback that calls back into the original sequence file. Select Debug»Terminate All to break the infinite loop.
• Do not define a SequenceFileLoad or SequenceFileUnload callback in the StationCallbacks.seq sequence file. TestStand does not call these callbacks.