You could set a global variable in the function and then check if that variable has been set. If set (the second time the function is called) exit the markup function.
If the double click caused two processes to be started on the host, this approach will probably not work. A workaround could be to start a script (batch file) such as if exist abc.tct goto END echo busy>abc.txt whatever.exe -a -b -c del abc.txt :END Not very elegant, but will probably solve your problem. ----
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