Dear Khaled, I'm sorry for the inconvenience.
I noticed that there is a "/bdup" command that is not listed anywhere. It works with binary variables. I found that it was added in version 7.42. As far as I know, it does the same as "/bcopy -c &outbvar 1 &inbvar 1 $bvar(&inbvar,0)".
Syntax: /bdup <&inbvar> <&outbvar>
I discovered using debugging programs.
I wonder if this is the correct way to use it, and why was it added in the version 7.42 undocumented?