Radio Shack TRS-80 PC-3 Owner's Manual page 123

-,
"PRO-3"
710:
990: END
Execution
Filename
"PRO-2"
Filename
"PRO-3"
,
During execution, when the Computer encounters the CHAIN statement, the next section is called into memory and executed.
In this manner, all of the sections are eventually run.
123