diff --git a/app/index.html b/app/index.html
index 52914ee..9b6a2aa 100644
--- a/app/index.html
+++ b/app/index.html
@@ -100,13 +100,16 @@
         console.log(api_secret_key);
         let api_temporary_token = null;
 
-        let api_base_url = null;
+        let api_server_base_url = app_config.api_server_base_url; // null;
+        let api_server_base_url_bak = app_config.api_server_base_url_bak;
+        let app_server_base_url = app_config.app_server_base_url;
+        // let file_base_url = app_config.file_server_base_url;
 
-        if (app_config.use_local_api) {
-            api_base_url = app_config.api_local_base_url; // 'http://api.localhost:5001'
-        } else {
-            api_base_url = app_config.api_remote_base_url; // 'https://api.oneskyit.com'
-        }
+        // if (app_config.use_local_api) {
+        //     api_server_base_url = app_config.api_local_base_url; // 'http://api.localhost:5001'
+        // } else {
+        //     api_server_base_url = app_config.api_remote_base_url; // 'https://api.oneskyit.com'
+        // }
 
         /* ***** **** *** ** * ### * ** *** **** ***** */
 
diff --git a/app/js/aether_native_app_v3.js b/app/js/aether_native_app_v3.js
index d6f293a..619bfa3 100644
--- a/app/js/aether_native_app_v3.js
+++ b/app/js/aether_native_app_v3.js
@@ -2,8 +2,12 @@
 const os = require('os');
 const path = require('path');
 const fs = require('fs');
+const child_process = require('child_process');
 const { ipcRenderer } = require('electron');
 
+// import psList from 'ps-list';
+// const ps_list = require('ps-list');
+
 let home_directory = require('os').homedir();
 console.log('Home: '+home_directory);
 
@@ -77,13 +81,26 @@ exports.load_config = function () {
         //close();
     }
 
+    config.home_directory = home_directory; // From the OS platform
+    config.tmp_directory = tmp_directory; // From the OS platform
+
     config.host_file_cache_path = config.host_file_cache_path.replace('[home]', home_directory);
     config.host_file_cache_path = config.host_file_cache_path.replace('[tmp]', tmp_directory);
     console.log(config.host_file_cache_path);
+    // if (fs.existsSync(config.host_file_cache_path)) {
+    // } else {
+    //     fs.mkdirSync(config.host_file_cache_path);
+    //     console.log(`Host file cache directory created: ${config.host_file_cache_path}`);
+    // }
 
     config.host_file_temp_path = config.host_file_temp_path.replace('[home]', home_directory);
     config.host_file_temp_path = config.host_file_temp_path.replace('[tmp]', tmp_directory);
     console.log(config.host_file_temp_path);
+    // if (fs.existsSync(config.host_file_temp_path)) {
+    // } else {
+    //     fs.mkdirSync(config.host_file_temp_path);
+    //     console.log(`Host file temp directory created: ${config.host_file_temp_path}`);
+    // }
 
     let import_config_to_ipc_result = ipcRenderer.invoke('import_config', config).then((result) => {
         console.log('IPC import config finished');
@@ -97,7 +114,7 @@ exports.load_config = function () {
 
 
 // Check for local file
-// Updated 2022-03-10
+// Updated 2022-05-06
 exports.check_local_file = async function ({local_file_path, filename}) {
     console.log('*** Electron framework export: check_local_file() ***');
     // console.log('Check for local file');
@@ -116,7 +133,7 @@ exports.check_local_file = async function ({local_file_path, filename}) {
 
 
 // Check local hash file cache
-// Updated 2022-03-09
+// Updated 2022-05-06
 exports.check_hash_file_cache = async function ({host_file_cache_path, hash}) {
     console.log('*** Electron framework export: check_hash_file_cache() ***');
     // console.log('Check local hash file cache');
@@ -124,7 +141,15 @@ exports.check_hash_file_cache = async function ({host_file_cache_path, hash}) {
 
     let hash_filename = `${hash}.file`;
 
-    let hash_file_cache_path = path.join(host_file_cache_path, hash_filename);
+    let subdirectory = hash_filename.substring(0,2);
+    let subdirectory_path = path.join(host_file_cache_path, subdirectory);
+    if (fs.existsSync(subdirectory_path)) {
+    } else {
+        console.log(`Hashed file subdirectory not found in cache: ${subdirectory_path}`);
+        return false;
+    }
+
+    let hash_file_cache_path = path.join(subdirectory_path, hash_filename);
     // console.log(hash_file_cache_path);
 
     if (fs.existsSync(hash_file_cache_path)) {
@@ -138,7 +163,7 @@ exports.check_hash_file_cache = async function ({host_file_cache_path, hash}) {
 
 
 // Download hash file to cache
-// Updated 2022-03-09
+// Updated 2022-05-06
 exports.download_hash_file_to_cache = async function ({host_file_cache_path, event_file_id=null, hash=null}) {
     console.log('*** Electron framework export: download_hash_file_to_cache() ***');
     // console.log('Download hash file to cache');
@@ -147,7 +172,16 @@ exports.download_hash_file_to_cache = async function ({host_file_cache_path, eve
     let endpoint = `/event/file/${event_file_id}/download`;
 
     let hash_filename = `${hash}.file`;
-    let hash_file_cache_path = path.join(host_file_cache_path, hash_filename);
+
+    let subdirectory = hash_filename.substring(0,2);
+    let subdirectory_path = path.join(host_file_cache_path, subdirectory);
+    if (fs.existsSync(subdirectory_path)) {
+    } else {
+        fs.mkdirSync(subdirectory_path);
+        console.log(`Subdirectory directory created: ${subdirectory_path}`);
+    }
+
+    let hash_file_cache_path = path.join(subdirectory_path, hash_filename);
     // console.log(hash_file_cache_path);
 
     let download_file_result = await ipcRenderer.invoke('download_file', api_base_url, endpoint, hash_file_cache_path).then((result) => {
@@ -169,13 +203,21 @@ exports.download_hash_file_to_cache = async function ({host_file_cache_path, eve
 
 
 // Open cached hash file after copying to temp directory
-// Updated 2022-03-09
+// Updated 2022-05-06
 exports.open_hash_file_to_temp = async function ({host_file_cache_path, hash, host_file_temp_path, filename}) {
     console.log('*** Electron framework export: open_hash_file_to_temp() ***');
     // console.log('Open cached hash file after copying to temp directory');
     console.log(`Host File Cache Path: ${host_file_cache_path}; Hash: ${hash}; Host File Temp Path: ${host_file_temp_path}; Filename: ${filename}`);
 
-    let open_hash_file_to_temp_result = await ipcRenderer.invoke('open_hash_file_to_temp', host_file_cache_path, hash, host_file_temp_path, filename).then((result) => {
+    let subdirectory = hash.substring(0,2);
+    let subdirectory_path = path.join(host_file_cache_path, subdirectory);
+    if (fs.existsSync(subdirectory_path)) {
+    } else {
+        console.log(`Hashed file subdirectory not found in cache: ${subdirectory_path}`);
+        return false;
+    }
+
+    let open_hash_file_to_temp_result = await ipcRenderer.invoke('open_hash_file_to_temp', subdirectory_path, hash, host_file_temp_path, filename).then((result) => {
         console.log('IPC open hash file to temp finished');
         console.log(result);
         return true;
@@ -384,7 +426,36 @@ exports.check_file_cache_and_open_local_file = async function ({host_file_cache_
 
         return open_local_file_result;
     })
+}
 
 
 
+// Kill processes
+// Updated 2022-05-06
+exports.kill_processes = async function ({process_name = null}) {
+    console.log('*** Electron framework export: kill_processes() ***');
+    console.log(process_name); // process_name or grep pattern
+
+    let command = `pkill ${process_name}`;
+    child_process.exec(command, (err, stdout, stdin) => {
+        if (err) throw err;
+        console.log(stdout);
+    });
+    console.log('Killed processes?');
+
+    // let command = `ps -aux | grep ${process_name}`;
+    // child_process.exec(command, (err, stdout, stdin) => {
+    //     if (err) throw err;
+    //     console.log(stdout);
+    // });
+
+    // console.log(await psList());
+    // console.log(await ps_list());
+
+    // let signal = 'SIGTERM'; // 'SIGTERM', 'SIGINT', 'SIGHUP'
+
+    // process.kill(pid, signal);
+
+    // process.kill(pid, 0); // Special case test if process exists
+    return true;
 }
\ No newline at end of file
diff --git a/config.json.default b/config.json.default
index dbc071f..cf6dfa6 100644
--- a/config.json.default
+++ b/config.json.default
@@ -9,7 +9,16 @@
   "event_location_code": "",
   "event_session_id": "",
 
-  "api_secret_key": "XXXXXX",
+  "api_secret_key": "ABCD1234XYZ",
+
+  "api_server_base_url": "http://dev-api.oneskyit.local:5005",
+  "app_server_base_url": "http://dev-demo.oneskyit.local:5000",
+  "file_server_base_url": "",
+
+  "api_server_base_url_bak": "https://dev-api.oneskyit.com",
+  "app_server_base_url_bak": "https://dev-demo.oneskyit.com",
+  "file_server_base_url_bak": "",
+
   "api_remote_base_url": "https://dev-fastapi.oneskyit.com",
   "api_local_base_url": "http://dev-fastapi.oneskyit.local:5005",
   "access_control_allow_origin": "*",
diff --git a/package-lock.json b/package-lock.json
index 7161c36..99141dc 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,18 +1,20 @@
 {
   "name": "aether_app_native",
-  "version": "3.0.0",
+  "version": "3.1.0",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "aether_app_native",
-      "version": "3.0.0",
+      "version": "3.1.0",
       "license": "ISC",
       "dependencies": {
         "axios": "^0.26.0",
+        "child_process": "^1.0.2",
         "fs": "0.0.1-security",
         "os": "^0.1.1",
-        "path": "^0.12.7"
+        "path": "^0.12.7",
+        "ps-list": "^8.1.0"
       },
       "devDependencies": {
         "electron": "^17.4.0",
@@ -293,6 +295,11 @@
         "node": ">=8"
       }
     },
+    "node_modules/child_process": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/child_process/-/child_process-1.0.2.tgz",
+      "integrity": "sha1-sffn/HPSXn/R1FWtyU4UODAYK1o="
+    },
     "node_modules/chromium-pickle-js": {
       "version": "0.2.0",
       "resolved": "https://registry.npmjs.org/chromium-pickle-js/-/chromium-pickle-js-0.2.0.tgz",
@@ -1635,6 +1642,17 @@
       "dev": true,
       "optional": true
     },
+    "node_modules/ps-list": {
+      "version": "8.1.0",
+      "resolved": "https://registry.npmjs.org/ps-list/-/ps-list-8.1.0.tgz",
+      "integrity": "sha512-NoGBqJe7Ou3kfQxEvDzDyKGAyEgwIuD3YrfXinjcCmBRv0hTld0Xb71hrXvtsNPj7HSFATfemvzB8PPJtq6Yag==",
+      "engines": {
+        "node": "^12.20.0 || ^14.13.1 || >=16.0.0"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
+    },
     "node_modules/pump": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/pump/-/pump-3.0.0.tgz",
@@ -2279,6 +2297,11 @@
         }
       }
     },
+    "child_process": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/child_process/-/child_process-1.0.2.tgz",
+      "integrity": "sha1-sffn/HPSXn/R1FWtyU4UODAYK1o="
+    },
     "chromium-pickle-js": {
       "version": "0.2.0",
       "resolved": "https://registry.npmjs.org/chromium-pickle-js/-/chromium-pickle-js-0.2.0.tgz",
@@ -3348,6 +3371,11 @@
       "dev": true,
       "optional": true
     },
+    "ps-list": {
+      "version": "8.1.0",
+      "resolved": "https://registry.npmjs.org/ps-list/-/ps-list-8.1.0.tgz",
+      "integrity": "sha512-NoGBqJe7Ou3kfQxEvDzDyKGAyEgwIuD3YrfXinjcCmBRv0hTld0Xb71hrXvtsNPj7HSFATfemvzB8PPJtq6Yag=="
+    },
     "pump": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/pump/-/pump-3.0.0.tgz",
diff --git a/package.json b/package.json
index 7f882d1..954c9e7 100644
--- a/package.json
+++ b/package.json
@@ -13,9 +13,11 @@
   "license": "ISC",
   "dependencies": {
     "axios": "^0.26.0",
+    "child_process": "^1.0.2",
     "fs": "0.0.1-security",
     "os": "^0.1.1",
-    "path": "^0.12.7"
+    "path": "^0.12.7",
+    "ps-list": "^8.1.0"
   },
   "devDependencies": {
     "electron": "^17.4.0",