Wait コマンドはある条件が満たされるまで待機させます。

id := Threads:-Create( int( sin(x)^x, x ), d );

                                    id := 1

print( d );

                                       d

Threads:-Wait( id );
print( d );

                                  /
                                 |        x
                                 |  sin(x)  dx
                                 |
                                /

id1 := Threads:-Create( int( (1/x)^x, x ), d1 );

                                   id1 := 2

id2 := Threads:-Create( int( x^x, x ), d2 );

                                   id2 := 3

print( d1, d2 );

                                    d1, d2

Threads:-Wait( id1, id2 );
print( d1, d2 );

                             /              /
                            |       x      |   x
                            |  (1/x)  dx,  |  x  dx
                            |              |
                           /              /