diff --git a/CHANGELOG.md b/CHANGELOG.md
index d5d5b47..d1fa398 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,10 @@
 # Miva IDE CHANGELOG
 
-## v1.27.0 (latest)
+## 1.28.0 (latest)
+
+* Added global variable autocompletion.
+
+## v1.27.0
 
 * Added tag mismatch validation for mvt tags.
 
diff --git a/package-lock.json b/package-lock.json
index 4e60558..8bba646 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
 	"name": "vscode-miva-ide",
-	"version": "1.27.0",
+	"version": "1.28.0",
 	"lockfileVersion": 3,
 	"requires": true,
 	"packages": {
 		"": {
 			"name": "vscode-miva-ide",
-			"version": "1.27.0",
+			"version": "1.28.0",
 			"workspaces": [
 				"client",
 				"server"
@@ -888,7 +888,9 @@
 			"dev": true
 		},
 		"node_modules/cross-spawn": {
-			"version": "7.0.3",
+			"version": "7.0.6",
+			"resolved": "https://registry.npmjs.org/cross-spawn/-/cross-spawn-7.0.6.tgz",
+			"integrity": "sha512-uV2QOWP2nWzsy2aMp8aRibhi9dlzF5Hgh5SHaB9OiTGEyDTiJJyx0uy51QXdyWbtAHNua4XJzUKca3OzKUd3vA==",
 			"license": "MIT",
 			"dependencies": {
 				"path-key": "^3.1.0",
diff --git a/package.json b/package.json
index 85d3b84..cf55d67 100644
--- a/package.json
+++ b/package.json
@@ -2,7 +2,7 @@
 	"name": "vscode-miva-ide",
 	"displayName": "Miva IDE",
 	"description": "Syntax highlighting, snippets and tools for building websites with Miva.",
-	"version": "1.27.0",
+	"version": "1.28.0",
 	"engines": {
 		"vscode": "^1.77.0",
 		"node": ">=16"
diff --git a/server/src/miva-features.ts b/server/src/miva-features.ts
index 7593f07..d40eb12 100644
--- a/server/src/miva-features.ts
+++ b/server/src/miva-features.ts
@@ -29,6 +29,7 @@ import {
 import { URI, Utils } from 'vscode-uri';
 import builtinFunctionData from './data/functions-builtin.json';
 import merchantFunctionFiles from './data/functions-merchant.json';
+import globalVariableData from './mv/global-variables';
 import mvOperatorData from './mv/operators';
 import systemVariableData from './mv/system-variables';
 import { mvSnippetData, mvTagData } from './mv/tags';
@@ -92,6 +93,7 @@ export function activateFeatures({workspaceSymbolProvider, mivaScriptCompilerPro
 	const builtinFunctionCompletions: CompletionList = CompletionList.create( parseCompletionFile( builtinFunctionData ) );
 	const builtinFunctionHoverMap: Map<string, MarkupContent> = getHoverMapFromCompletionFile( builtinFunctionData, false );
 	const systemVariableCompletions: CompletionList = CompletionList.create( parseCompletionFile( Object.values( systemVariableData ) ) );
+	const globalVariableCompletions: CompletionList = CompletionList.create( parseCompletionFile( Object.values( globalVariableData ) ) );
 	const operatorCompletions: CompletionList = CompletionList.create( parseCompletionFile( Object.values( mvOperatorData ) ) );
 
 	// Document cache for Miva Script (this is globally defined since we use .mv documents in MVT for LSK lookups)
@@ -140,15 +142,18 @@ export function activateFeatures({workspaceSymbolProvider, mivaScriptCompilerPro
 				?.map(_variable => _variable.replace(foundVariableRegex, ''));
 
 			return CompletionList.create(
-				foundVariables.map((variable) => {
-					return parseCompletion({
-						"label": variable,
-						"kind": "Variable",
-						"detail": variable,
-						"documentation": "",
-						"commitCharacters": []
-					});
-				})
+				[
+					...globalVariableCompletions.items,
+					...foundVariables.map((variable) => {
+						return parseCompletion({
+							"label": variable,
+							"kind": "Variable",
+							"detail": variable,
+							"documentation": "",
+							"commitCharacters": []
+						});
+					})
+				]
 			);
 
 		}
@@ -748,6 +753,16 @@ export function activateFeatures({workspaceSymbolProvider, mivaScriptCompilerPro
 					}
 				}
 
+				// System variable hover
+				if (patterns.SHARED.LEFT_VARIABLE_G.test(left)) {
+					const foundGlobalVariable = globalVariableData[wordLower];
+					if (foundGlobalVariable) {
+						return {
+							contents: foundGlobalVariable.documentation
+						};
+					}
+				}
+
 				// Tag name hover
 				if (patterns.MVT.LEFT_IN_MVT_TAG.test(left)) {
 					// Determine which tag we are in
diff --git a/server/src/mv/global-variables.ts b/server/src/mv/global-variables.ts
new file mode 100644
index 0000000..8b813fd
--- /dev/null
+++ b/server/src/mv/global-variables.ts
@@ -0,0 +1,119 @@
+import { CompletionItemKind } from 'vscode-languageserver';
+import { BaseGlobalVariableData, GlobalVariableData } from '../util/interfaces';
+
+const baseGlobalVariableData: BaseGlobalVariableData = {
+	kind: CompletionItemKind.Variable
+};
+
+const globalVariableData: Record<string, GlobalVariableData> = {
+	action: {
+		...baseGlobalVariableData,
+		label: 'Action',
+		detail: 'Action',
+		documentation: ``
+	},
+	order_id: {
+		...baseGlobalVariableData,
+		label: 'Order_ID',
+		detail: 'Order ID',
+		documentation: ``
+	},
+	store_code: {
+		...baseGlobalVariableData,
+		label: 'Store_Code',
+		detail: 'Store Code',
+		documentation: ``
+	},
+	product_code: {
+		...baseGlobalVariableData,
+		label: 'Product_Code',
+		detail: 'Product Code',
+		documentation: ``
+	},
+	category_code: {
+		...baseGlobalVariableData,
+		label: 'Category_Code',
+		detail: 'Category Code',
+		documentation: ``
+	},
+	page_code: {
+		...baseGlobalVariableData,
+		label: 'Page_Code',
+		detail: 'Page Code',
+		documentation: ``
+	},
+	error_code: {
+		...baseGlobalVariableData,
+		label: 'Error_Code',
+		detail: 'Error Code',
+		documentation: ``
+	},
+	error_message: {
+		...baseGlobalVariableData,
+		label: 'Error_Message',
+		detail: 'Error Message',
+		documentation: ``
+	},
+	mvdo_error: {
+		...baseGlobalVariableData,
+		label: 'MvDO_Error',
+		detail: 'MvDO Error Message',
+		documentation: `Error message from the last ran \`<mvt:do>\` tag.`
+	},
+	mvcall_error: {
+		...baseGlobalVariableData,
+		label: 'MvCALL_Error',
+		detail: 'MvCALL Error Message',
+		documentation: `Error message from the last ran \`<mvt:call>\` tag.`
+	},
+	screen: {
+		...baseGlobalVariableData,
+		label: 'Screen',
+		detail: 'Screen',
+		documentation: ``
+	},
+	session_type: {
+		...baseGlobalVariableData,
+		label: 'Session_Type',
+		detail: 'Session Type',
+		documentation: ``
+	},
+	session_id: {
+		...baseGlobalVariableData,
+		label: 'Session_ID',
+		detail: 'Session ID',
+		documentation: ``
+	},
+	merchant_local_timezone: {
+		...baseGlobalVariableData,
+		label: 'Merchant_Local_Timezone',
+		detail: 'Merchant Local Timezone',
+		documentation: `Timezone of the server.`
+	},
+	module_root_versionless: {
+		...baseGlobalVariableData,
+		label: 'Module_Root_Versionless',
+		detail: 'Module Root Versionless',
+		documentation: `Example: \`/mm5/\``
+	},
+	module_root: {
+		...baseGlobalVariableData,
+		label: 'Module_Root',
+		detail: 'Module Root',
+		documentation: `Example: \`/mm5/5.00/\``
+	},
+	customer_session_id: {
+		...baseGlobalVariableData,
+		label: 'Customer_Session_ID',
+		detail: 'Customer Session ID',
+		documentation: ``
+	},
+	customer_session_verified: {
+		...baseGlobalVariableData,
+		label: 'Customer_Session_Verified',
+		detail: 'Customer Session Verified',
+		documentation: ``
+	}
+};
+
+export default globalVariableData;
diff --git a/server/src/util/interfaces.ts b/server/src/util/interfaces.ts
index 82a5c78..2845058 100644
--- a/server/src/util/interfaces.ts
+++ b/server/src/util/interfaces.ts
@@ -243,6 +243,16 @@ export interface SystemVariableData extends BaseSystemVariableData {
 	documentation: string;
 }
 
+export interface BaseGlobalVariableData {
+	kind: CompletionItemKind;
+}
+
+export interface GlobalVariableData extends BaseGlobalVariableData {
+	label: string;
+	detail: string;
+	documentation: string;
+}
+
 export interface SymbolInformationWithDocumentation extends SymbolInformation {
 	documentation?: MarkupContent;
 };