User defined statements - @USE

EDT allows users to create their own statements. To this end, the function of the statement must be implemented in the form of an external routine (statement routine). This routine is usually stored as a module in a library. However, it is also possible to integrate statement routines directly in a main program which then starts EDT via the subroutine interface.

A statement routine is defined with the @USE statement and can be called by means of the user statement symbol declared in @USE.

If a text follows the user-defined statement then this is passed to the statement routine. When control is returned, the statement routine can pass a message to EDT.