Active Process

Active Process in most cases is the latest process run in the console. That is your shell (cmd, powershell, bash) if you are in the prompt, and current console tool during some command execution (perl, git, ssh, etc.)

Active process in ConEmu StatusBar

You can see Active Process name, bitness and PID in the StatusBar or in the TabBar if you choose appropriate Tab template. For example template %s {%p} will show timeout {21564}.

Note Active Process is console shell or tool or ChildGui application, but is neither ConEmu[64].exe nor ConEmuC[64].exe.