We have left out a number of Tcl commands as they are outside of the scope of this tutorial. We list some of them here to show some of what Tcl can do. Please refer to the Tcl manual for more information.
implements the HTTP protocol for retrieving web pages
a modules systems for Tcl
commands can be attached to variables that are triggered when the variable changes value (amongst other things)
start, stop, and manage processes
UNIX and Internet style socket management
load extension packages into Tcl and use their facilities as native Tcl commands