SYNTAX            : @;E

RESULTING ARGUMENT: None

FUNCTION          : Generate a file-requester on the current direcory. Then
                    execute the user-picked file as a command-file.

NOTE              : Command interpretation is identical to what happens
                    when commands are entered interactively:
                    - a double-ESC ends a command sequence;
                    - any error terminates a command sequence, upon which
                      the next command is read from the file;
                    - CTRL_C and CTRL_G may be used to abort;
                    - etc.

MATRIX