diff --git a/boot/bootprefix.js b/boot/bootprefix.js
index bff9a2aa2..ae0712d4e 100644
--- a/boot/bootprefix.js
+++ b/boot/bootprefix.js
@@ -20,9 +20,15 @@ $tw = $tw || Object.create(null);
 $tw.boot = $tw.boot || Object.create(null);
 
 // Detect platforms
-$tw.browser = typeof(window) !== "undefined" ? {} : null;
-$tw.node = typeof(process) === "object" ? {} : null;
-$tw.nodeWebKit = $tw.node && global.window && global.window.nwDispatcher ? {} : null;
+if(!("browser" in $tw)) {
+	$tw.browser = typeof(window) !== "undefined" ? {} : null;
+}
+if(!("node" in $tw)) {
+	$tw.node = typeof(process) === "object" ? {} : null;
+}
+if(!("nodeWebKit" in $tw)) {
+	$tw.nodeWebKit = $tw.node && global.window && global.window.nwDispatcher ? {} : null;
+}
 
 // Set default boot tasks
 $tw.boot.tasks = {
diff --git a/core/modules/commands/editions.js b/core/modules/commands/editions.js
index 271b62e71..cc802b9f5 100644
--- a/core/modules/commands/editions.js
+++ b/core/modules/commands/editions.js
@@ -23,35 +23,12 @@ var Command = function(params,commander) {
 };
 
 Command.prototype.execute = function() {
-	var fs = require("fs"),
-		path = require("path"),
-		self = this;
-	// Enumerate the edition paths
-	var editionPaths = $tw.getLibraryItemSearchPaths($tw.config.editionsPath,$tw.config.editionsEnvVar),
-		editions = {};
-	for(var editionIndex=0; editionIndex<editionPaths.length; editionIndex++) {
-		var editionPath = editionPaths[editionIndex];
-		// Enumerate the folders
-		var entries = fs.readdirSync(editionPath);
-		for(var entryIndex=0; entryIndex<entries.length; entryIndex++) {
-			var entry = entries[entryIndex];
-			// Check if directories have a valid tiddlywiki.info
-			if(!editions[entry] && $tw.utils.isDirectory(path.resolve(editionPath,entry))) {
-				var info;
-				try {
-					info = JSON.parse(fs.readFileSync(path.resolve(editionPath,entry,"tiddlywiki.info"),"utf8"));
-				} catch(ex) {
-				}
-				if(info) {
-					editions[entry] = info.description || "";
-				}
-			}
-		}
-	}
+	var self = this;
 	// Output the list
 	this.commander.streams.output.write("Available editions:\n\n");
-	$tw.utils.each(editions,function(description,name) {
-		self.commander.streams.output.write("    " + name + ": " + description + "\n");
+	var editionInfo = $tw.utils.getEditionInfo();
+	$tw.utils.each(editionInfo,function(info,name) {
+		self.commander.streams.output.write("    " + name + ": " + info.description + "\n");
 	});
 	this.commander.streams.output.write("\n");
 	return null;
diff --git a/core/modules/filters/editiondescription.js b/core/modules/filters/editiondescription.js
new file mode 100644
index 000000000..bca03e9bc
--- /dev/null
+++ b/core/modules/filters/editiondescription.js
@@ -0,0 +1,31 @@
+/*\
+title: $:/core/modules/filters/editiondescription.js
+type: application/javascript
+module-type: filteroperator
+
+Filter operator for returning the descriptions of the specified edition names
+
+\*/
+(function(){
+
+/*jslint node: true, browser: true */
+/*global $tw: false */
+"use strict";
+
+/*
+Export our filter function
+*/
+exports.editiondescription = function(source,operator,options) {
+	var results = [],
+		editionInfo = $tw.utils.getEditionInfo();
+	if(editionInfo) {
+		source(function(tiddler,title) {
+			if($tw.utils.hop(editionInfo,title)) {
+				results.push(editionInfo[title].description || "");				
+			}
+		});
+	}
+	return results;
+};
+
+})();
diff --git a/core/modules/filters/editions.js b/core/modules/filters/editions.js
new file mode 100644
index 000000000..36f1dc8fd
--- /dev/null
+++ b/core/modules/filters/editions.js
@@ -0,0 +1,30 @@
+/*\
+title: $:/core/modules/filters/editions.js
+type: application/javascript
+module-type: filteroperator
+
+Filter operator for returning the names of the available editions in this wiki
+
+\*/
+(function(){
+
+/*jslint node: true, browser: true */
+/*global $tw: false */
+"use strict";
+
+/*
+Export our filter function
+*/
+exports.editions = function(source,operator,options) {
+	var results = [],
+		editionInfo = $tw.utils.getEditionInfo();
+	if(editionInfo) {
+		$tw.utils.each(editionInfo,function(info,name) {
+			results.push(name);
+		});
+	}
+	results.sort();
+	return results;
+};
+
+})();
diff --git a/core/modules/utils/edition-info.js b/core/modules/utils/edition-info.js
new file mode 100644
index 000000000..d3e7054b0
--- /dev/null
+++ b/core/modules/utils/edition-info.js
@@ -0,0 +1,48 @@
+/*\
+title: $:/core/modules/utils/edition-info.js
+type: application/javascript
+module-type: utils-node
+
+Information about the available editions
+
+\*/
+(function(){
+
+/*jslint node: true, browser: true */
+/*global $tw: false */
+"use strict";
+
+var fs = require("fs"),
+	path = require("path");
+
+var editionInfo;
+
+exports.getEditionInfo = function() {
+	if(!editionInfo) {
+		// Enumerate the edition paths
+		var editionPaths = $tw.getLibraryItemSearchPaths($tw.config.editionsPath,$tw.config.editionsEnvVar);
+		editionInfo = {};
+		for(var editionIndex=0; editionIndex<editionPaths.length; editionIndex++) {
+			var editionPath = editionPaths[editionIndex];
+			// Enumerate the folders
+			var entries = fs.readdirSync(editionPath);
+			for(var entryIndex=0; entryIndex<entries.length; entryIndex++) {
+				var entry = entries[entryIndex];
+				// Check if directories have a valid tiddlywiki.info
+				if(!editionInfo[entry] && $tw.utils.isDirectory(path.resolve(editionPath,entry))) {
+					var info;
+					try {
+						info = JSON.parse(fs.readFileSync(path.resolve(editionPath,entry,"tiddlywiki.info"),"utf8"));
+					} catch(ex) {
+					}
+					if(info) {
+						editionInfo[entry] = info;
+					}
+				}
+			}
+		}
+	}
+	return editionInfo;
+};
+
+})();
diff --git a/core/modules/widgets/browse.js b/core/modules/widgets/browse.js
index dd830be62..195bda8d6 100644
--- a/core/modules/widgets/browse.js
+++ b/core/modules/widgets/browse.js
@@ -42,10 +42,13 @@ BrowseWidget.prototype.render = function(parent,nextSibling) {
 	if(this.tooltip) {
 		domNode.setAttribute("title",this.tooltip);
 	}
+	if(this.nwsaveas) {
+		domNode.setAttribute("nwsaveas",this.nwsaveas);
+	}
 	// Add a click event handler
 	domNode.addEventListener("change",function (event) {
 		if(self.message) {
-			self.dispatchEvent({type: self.message, param: event.target.files});
+			self.dispatchEvent({type: self.message, param: self.param, files: event.target.files});
 		} else {
 			self.wiki.readFiles(event.target.files,function(tiddlerFieldsArray) {
 				self.dispatchEvent({type: "tm-import-tiddlers", param: JSON.stringify(tiddlerFieldsArray)});
@@ -65,7 +68,9 @@ Compute the internal state of the widget
 BrowseWidget.prototype.execute = function() {
 	this.browseMultiple = this.getAttribute("multiple");
 	this.message = this.getAttribute("message");
+	this.param = this.getAttribute("param");
 	this.tooltip = this.getAttribute("tooltip");
+	this.nwsaveas = this.getAttribute("nwsaveas");
 };
 
 /*
diff --git a/editions/prerelease/tiddlers/FilterOperator editiondescription.tid b/editions/prerelease/tiddlers/FilterOperator editiondescription.tid
new file mode 100644
index 000000000..686de3d28
--- /dev/null
+++ b/editions/prerelease/tiddlers/FilterOperator editiondescription.tid	
@@ -0,0 +1,10 @@
+created: 20150111145738451
+modified: 20150111145738451
+tags: Filters
+caption: editiondescription
+title: FilterOperator: editiondescription
+type: text/vnd.tiddlywiki
+
+The ''editiondescription'' filter operator returns a description string for each edition name in the current results. It is only available under Node.js.
+
+Also see [[FilterOperator: editions]].
diff --git a/editions/prerelease/tiddlers/FilterOperator editions.tid b/editions/prerelease/tiddlers/FilterOperator editions.tid
new file mode 100644
index 000000000..5dfa3b7d0
--- /dev/null
+++ b/editions/prerelease/tiddlers/FilterOperator editions.tid	
@@ -0,0 +1,8 @@
+created: 20150111145738451
+modified: 20150111145738451
+tags: Filters
+caption: editions
+title: FilterOperator: editions
+type: text/vnd.tiddlywiki
+
+The ''editions'' filter operator returns the names of all the available editions. It is only available under Node.js.