_so = SharedObject.getLocal(”SharedObjectID”,”/”);

One thing to be careful of is to not allow the ability of other .swf movies (other than your own) to retrieve/edit/delete this object.

Here is my document class ObjectSharing.as

package
{
	/*
	Original Source
	http://livedocs.adobe.com/flex/2/langref/flash/net/SharedObject.html#includeExamplesSummary
	*/

	import flash.display.Sprite;
	import flash.events.MouseEvent;
	import flash.events.NetStatusEvent;
	import flash.net.SharedObject;
	import flash.net.SharedObjectFlushStatus;
	import flash.text.TextField;
	import flash.text.TextFieldAutoSize;
	import flash.text.TextFieldType;
	import flash.text.TextFormat;

	public class ObjectSharing extends Sprite {  

		private var mySo:SharedObject;

		public function ObjectSharing()
		{
			buildUI();
			saveBtn.addEventListener(MouseEvent.CLICK, saveValue);
			clearBtn.addEventListener(MouseEvent.CLICK, clearValue);

			mySo = SharedObject.getLocal("application-name");
			output.appendText("SharedObject loaded...\n");
			output.appendText("loaded value: " + mySo.data.savedValue + "\n\n");

			if ( mySo.data.savedValue )
			{
				soStatus.text = mySo.data.savedValue;
			}
			else
			{
				soStatus.text = "undefined";
			}

    	}  

		private function saveValue(event:MouseEvent):void {
        	output.appendText("saving value...\n");
        	mySo.data.savedValue = input.text;

			var flushStatus:String = null;

			try
			{
            	flushStatus = mySo.flush(10000);
        	} catch (error:Error) {
            	output.appendText("Error...Could not write SharedObject to disk\n");
			}

        	if (flushStatus != null)
			{
            	switch (flushStatus)
				{
                	case SharedObjectFlushStatus.PENDING:
                    	output.appendText("Requesting permission to save object...\n");
                    	mySo.addEventListener(NetStatusEvent.NET_STATUS, onFlushStatus);
                    	break;
					case SharedObjectFlushStatus.FLUSHED:
                    	output.appendText("Value flushed to disk.\n");
                    	break;
				}
			}
        	output.appendText("\n");

			soStatus.text = mySo.data.savedValue;
		}

		private function clearValue(event:MouseEvent):void {
        	output.appendText("Cleared saved value...Reload SWF and the value should be \"undefined\".\n\n");
        	delete mySo.data.savedValue;

			soStatus.text = "[deleted] value is: " + mySo.data.savedValue;
    	}

		private function onFlushStatus(event:NetStatusEvent):void {
			output.appendText("User closed permission dialog...\n");
			switch (event.info.code)
			{
            	case "SharedObject.Flush.Success":
                	output.appendText("User granted permission -- value saved.\n");
                	break;
            	case "SharedObject.Flush.Failed":
                	output.appendText("User denied permission -- value not saved.\n");
                	break;
        	}  

			output.appendText("\n");

        	mySo.removeEventListener(NetStatusEvent.NET_STATUS, onFlushStatus);
		}  

    	// UI elements
    	private var inputLbl:TextField;
    	private var input:TextField;
    	private var output:TextField;
		private var soStatus:TextField;
		private var soStatusLbl:TextField;
   	 	private var saveBtn:Sprite;
    	private var clearBtn:Sprite;

    	private function buildUI():void
		{
			// White Text Formatting
			var whiteFormat:TextFormat = new TextFormat();
			whiteFormat.font = "Arial";
			whiteFormat.color = 0xffffff;
            whiteFormat.size = 10;
            whiteFormat.underline = false;

			// Black Text Formatting
			var blackFormat:TextFormat = new TextFormat();
			blackFormat.font = "Arial";
			blackFormat.color = 0x000000;
            blackFormat.size = 12;
            blackFormat.underline = false;

			// Small Black Text Formatting
			var smallBlackFormat:TextFormat = new TextFormat();
			smallBlackFormat.font = "Arial";
			smallBlackFormat.color = 0x000000;
            smallBlackFormat.size = 10;
            smallBlackFormat.underline = false;

			// New Shared Object Name
			var soFormat:TextFormat = new TextFormat();
			soFormat.font = "Arial";
			soFormat.color = 0x336699;
            soFormat.size = 12;
            soFormat.underline = false;

			// New Output Shared Object
			var soOutFormat:TextFormat = new TextFormat();
			soOutFormat.font = "Arial";
			soOutFormat.color = 0x009900;
            soOutFormat.size = 14;
            soOutFormat.underline = false;

        	// input label
        	inputLbl = new TextField();
			inputLbl.defaultTextFormat = whiteFormat;
        	addChild(inputLbl);
        	inputLbl.x = 10;
        	inputLbl.y = 10;
        	inputLbl.text = "Value to save:";

        	// input TextField
       		input = new TextField();
			input.defaultTextFormat = soFormat;
        	addChild(input);
        	input.x = 80;
        	input.y = 10;
        	input.width = 100;
        	input.height = 20;
        	input.border = true;
        	input.background = true;
        	input.type = TextFieldType.INPUT;

        	// output TextField
        	output = new TextField();
			output.defaultTextFormat = smallBlackFormat;
        	addChild(output);
        	output.x = 10;
        	output.y = 35;
            output.width = 250;
            output.height = 250;
            output.multiline = true;
            output.wordWrap = true;
            output.border = true;
            output.background = true;

			// SharedObject Status Field
			soStatus = new TextField();
			soStatus.defaultTextFormat = soOutFormat;
			addChild(soStatus);
			soStatus.x = 300;
        	soStatus.y = 35;
            soStatus.width = 200;
            soStatus.height = 30;
            soStatus.multiline = true;
            soStatus.wordWrap = true;
            soStatus.border = true;
            soStatus.background = true;

			soStatusLbl = new TextField();
			soStatusLbl.defaultTextFormat = whiteFormat;
			addChild(soStatusLbl);
			soStatusLbl.x = 300;
			soStatusLbl.y = 15;
			soStatusLbl.width = 250;
			soStatusLbl.height = 20;
			soStatusLbl.text = "Current Value of Shared Object:";
			soStatusLbl.selectable = false;

            // Save button
            saveBtn = new Sprite();
            addChild(saveBtn);
            saveBtn.x = 190;
            saveBtn.y = 10;
            saveBtn.useHandCursor = true;
            saveBtn.graphics.lineStyle(1);
            saveBtn.graphics.beginFill(0xcccccc);
            saveBtn.graphics.drawRoundRect(0, 0, 30, 20, 5, 5);
            var saveLbl:TextField = new TextField();
			saveLbl.defaultTextFormat = smallBlackFormat;
            saveBtn.addChild(saveLbl);
            saveLbl.text = "Save";
            saveLbl.selectable = false;

            // Clear button
            clearBtn = new Sprite();
            addChild(clearBtn);
            clearBtn.x = 230;
            clearBtn.y = 10;
            clearBtn.useHandCursor = true;
            clearBtn.graphics.lineStyle(1);
            clearBtn.graphics.beginFill(0xcccccc);
            clearBtn.graphics.drawRoundRect(0, 0, 30, 20, 5, 5);
            var clearLbl:TextField = new TextField();
			clearLbl.defaultTextFormat = smallBlackFormat;
            clearBtn.addChild(clearLbl);
            clearLbl.text = "Clear";
            clearLbl.selectable = false;
        }
    }
}