Kepware execute tag from client/rest server

Dear community,

another very basic question from me;

if I want to "execute" a tag which basically just sends a hard coded string to an device; how do I do that from the client perspective?

I have configured an tag in UCON which sends a string. Furthermore I do not want to periodically send the string; only when the client application wants it.
I know I could get data from the client for this tag (for example a '01' ASCII string)  and could use IF-branching in UCON to execute the transmit command if the tag contains the data '01'. 

But I think I have overlooked something; I feel like there should be a "right"/"easier" way to do that from the client application.

I have looked into the documentation but haven't found an satisfying answer yet; please help me.

Kind regards