More info, please. What is $stack(0,...) supposed to represent?

Your lines can be shortened to

if $system.Process.ClientExecutableName($j) = "..." { ... } else { ... }

justmy2cents

Port 1972 is the default port, your actual port may be different. That's why I added a comment to the answer above. Check the parameter file of your installation:

for IRIS : see iris.cpf, section [Startup], DefaultPort=...  
for Cache: see cache.cpf, section [Startup], DefaultPort=...