You can expand the functionality of both Lasso and Tango by sending Apple Events to other applications. The double quotes should be the fancy kind created with the option left bracket and shift option left bracket key combinations. Blueworld provides the Lasso Capture AE control panel that will get you pretty close to the syntax. The Frontier root can be a pretty good source of apple event information, too. Tango's apple event sending capabilities are not as powerful because Tango can't send apple events to application's with object model based dictionaries.
Most applications do have dictionaries that are object model based.
MondoMail doesn't and is therefore a popular tool for Tango users. If you do need to control an application from Tango that has an object model based dictionary, you have to use an applescript as a go between. Tango's external action is where the apple event information should be entered. Tango requires a relative path to the application, the Event Class Code, and the Event Code. All the codes must be four characters long.