- LesTecML Mailer Email Client with Rexx Interface - Modular And Integrated Design V2.0 for Windows 95/98/2000/NT/XP and OS/2 and LesTecML Mailer for Windows. Use Rexx to control your emails. Creating and customising GUI applications has never been easier. Simply draw your dialogs and they work instantly. Useful for beginners and experienced users. Modular And Integrated Design uses basic rexx ...www.lestec.com.au