- interaction with an smtp server / a Tcl interpreter / a TeX installation,
- file scanning,
- file management,
Excerpt from the Alpha Manual:
Differences between 'Alpha' and 'AlphaTcl'The program Alpha has two parts: one compiled binary part and a big library of scripts written in Tcl (Dr. Ousterhout's Tool Command Language). The binary part handles windows, mouse movements, and all such, and then it has a built-in Tcl interpreter which drives the second part AlphaTcl, the vast library of Tcl scripts that provide most of Alpha's functionality. Most editing functions, actions taken when a menu item is selected or a key combination is pressed, and all of Alpha's packages and extensions are implemented in Tcl. With this design it is easy to configure and extend Alpha --- anybody can tweak Alpha's behavior by modifying Tcl functions, or extend Alpha by writing a new package!Of course, you don't have to learn Tcl to use Alpha --- Alpha is designed to be operated through a graphical user interface, and in normal operation you will never be confronted with Tcl. But if you want to become a real power user, you should consider taking a look at Tcl --- it is one of the easiest scripting languages to learn. Then the possibilities of customizing Alpha are unlimited.