Trade System Designer (TSD) includes a full-featured scripting language, allowing the user to write systems for MetaStock which have more power and flexibility than ever before, including loop functionality.

Included in this scripting language are access to over 130 built-in indicators and candlestick pattern matching functions.  See the manual for a complete list of these indicators.

Also included (with full script source) is a Trailing Stops function, which automatically handles trailing stops after an entry has been made. 

Also, virtually any function from any add-on DLL for MetaStock may be called from within your script. For example, you can easily call the PowerPivots "TimeCapsules" function (assuming you own the PowerPivots addon) and use the results within your script.

Take a look at the Example Script (under the Features menu) for a sample of a complete system created within the scripting language.