[bborb]

G101 (Begin registration of sub-turret program)
T101
G0 B.1
G1 B-.5 F.01
G0 B3.5
M90 (sub turret waiting command)
G100 (End of sub-turret program)
G0 G40 G97 S1200 T0202 M03
G0 X1. Z0.
G1 X 0. F.007
G0 Z.1
X1.
M40 (execute sub-turret program (or is it M41?))
G1 Z-1.0
X1.06
G0 X5. Z5.
M90 (main prog. waiting command)
M30

When an M90 is read from either main prog or sub-turret prog, that axis stops action until an M90 is read from the other prog.
The sub-turret program is not shown on the CRT while machine is executing program.

I think
G110 T101
indexes to station 1 on sub-turret. (T102, T103. etc.)
Again, using G110 is simple "one shot" programming and simultaneous machining of both turrets does not occur.