How to check program is opened during computer

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C#

There are 2 computers in A,B
if A have to know B program opened. What should I do?
Maybe refer by IP Address or Computer name

The single computer as below :

private bool ProgramIsRunning(string FullPath)
    {
        string FilePath =  Path.GetDirectoryName(FullPath);
        string FileName = Path.GetFileNameWithoutExtension(FullPath).ToLower();
        bool isRunning = false;

        Process[] pList = Process.GetProcessesByName(FileName);
        foreach (Process p in pList)
            if(p.MainModule.FileName.StartsWith(FilePath, StringComparison.InvariantCultureIgnoreCase))
                isRunning = true;

        return isRunning;
    }


ProgramIsRunning(@"c:\loc1\test.exe");

What I have tried:

I must control all the computer is program open