SET_UNDO <undo type>
<undo type> may be one of the following
* TOOL_NEW |
* TOOL_DEL |
* TOOL_MOVE |
* OP_NEW |
* OP_DEL |
* OP_MOVE |
* PROC_NEW |
* PROC_DEL |
* PROC_MOVE |
* WG_NEW |
* WG_DEL |
* WG_MOD |
* CS_NEW |
* CS_DEL |
* CS_MOD |
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