How to create a DOS function ? (known also as a subroutine)

About

functions in dos are:

• created and named with a label
• called with the CALL command creating a subroutine
• exited with the goto command

Example

CALL :function arguments

:function
REM exit the subroutine 
goto :EOF

where:

• arguments are the argument of the subroutine
• goto :eof exit the subroutine