Tcla stands for Tool Command Language - Amiga, and it provides several 
commands (via the C interface) that have been added to Tcl to support 
Amigas, including support for CLI commands, windows, menus, resources,
file requesters, alerts and message passing between Tcla programs.  
Tcla was created by Karl Lehenbauer of Hackercorp.

This package contains both Tcl and Tcla, packaged as an Amiga shared
library, tcla.library.   The Tcla code is copyrighted by Hackercorp, 
but we allow redistribution for any purpose subject to minimal
requirements regarding maintaining copyright and disclaimer messages.

tcla.library, in addition to providing the basic capabilities of Tcl, has
additional support for many Amiga-specific functions, such as executing
CLI commands and getting the result back as a string,  opening and 
manipulating windows and processing window events, file requesters, alerts,
support for menus and gadgets, and provides sharable Tcl-based handles to 
various application-specific data entities (resource banks).  Further, all 
Tcla programs have the ability to send and  receive Tcl commands to and 
from other Tcla programs.  (See the Tcla documentation, or help within
Tcla.