Rockwell Automation 9301 Series RSView32 Users Guide - Manual (Page 591)

Sharing data with other Windows applications
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16–29
Enabling RSView32 for tag writes
By default, other applications cannot write to tags in RSView32. To
enable writing to tags, you have to issue the RTDataWriteEnable
command (from the command line or another RSView32
component).
Example: Writing to a tag
The following example shows a Microsoft Excel macro that will write
to the Process\Ingred1\SP tag in the Samples project. Microsoft
Excel is the DDE client and RSView32 is the DDE server.