+ returns the current command separator.  Use this variable, instead of 
the actual command separator, if you want your batch files and aliases to 
work regardless of how the command separator is defined.  For example, if 
the command separator is an ampersand [&] (the default in CMD.EXE) both of 
the commands below will display "Hello" on one line and "world" on the 
next. However, if the command separator has been changed the first command 
will display "Hello & echo world", while the second command will continue 
to work as intended. 

        echo Hello & echo world
        echo Hello %+ echo world