You saw several different kinds of blocks in the example procedures from the first two chapters. To review them:

• Every procedure itself constitutes a block, even just the simplest RUN statement executed from an editor window.
• Every call to another procedure, whether internal or external, starts another block. An external procedure can contain one or more internal procedures, each of which forms its own block.
• ABL statements such as FOR EACH and DO define the start of a new block.
• A trigger is a block of its own.