Creating a New Tcl Command

• Registering the Command
• Parsing the Arguments
• Returning a Result
• Writing the Code Itself

In general, for speed we wish our main algorithm to be written in C. Tcl is an interpreted language and runs very much slower than compiled C. As Tcl provides a method to extend the language with our own commands we will create a new command, which in this case is to be named "composition".