Identification

• A file with the tcl file extension is known as a Tcl Script. The tcl file extension serves as a marker to your computer, signifying which language the file is created with.
  
  

Source

• Tcl files are associated with the computer programming language known as Tool Command Language. The Tool Command Language is sometimes called "tickle."
  
  

Function

• Tcl files contain the program or instructions of a Tool Command Language project. Tcl files are typically used to power text editors, programs used to find errors within programs and shells, which are a part of a computer's operating system that affects the way windows and other elements are displayed.
  
  

Programs

• Programs used for Tool Command Language that produce tcl files include Wish and TCish.
  
  

Systems

• Tcl files can be used on computers running Windows, Linux and Mac operating systems.