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I use a Win 10 machine with different users, and these all can use a same bat file.

In the bat scripts I need a temporary file with an unique name consisting of an identfier for the process currently at hand on that machine. There thus can be multiple such processes at the same time.

As file name a want to use C:WindowsTemp???.txt.

The question is what ??? must be.

The Answer

If you want to use the PID of cmd.exe then do this:

title=uniqueTitle

for /f "tokens=2 USEBACKQ" %f IN (`tasklist /NH /FI "WINDOWTITLE eq uniqueTitle*"`) Do set ourPID=%f

i_view64.exe inputfile.jpg /info=%temp%%ourPID%.txt

Me rambling because I didn't understand the question:

In the context of a batch file running the "current process at hand" is that of the command interpreter (conhost.exe or cmd.exe). If you want to get the process ID of the i_view64.exe you would have to first run it and then get the process ID (which is non-trivial). In your case you are asking for the process ID before it has been created. There is no way to predict what it will be at the time you are feeding a command line argument to the process, as it hasn't started.

If you just want a unique temporary file name in a safe, reliable location then you should check out this question:

https://stackoverflow.com/questions/27802376/create-unique-file-name-windows-batch

There are a number of suggested solutions.

Generally you use %TEMP% to get the temp location on the system. Then you generate your filename.

something like this might work for you:

%temp%%username%-%date%-%random%.txt

Adjust as needed. Each of those variables expand to create a full path to a file.