Release 10.1A: OpenEdge Development:
Progress 4GL Handbook

Blocks and block properties

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.
Progress 4GL statements such as FOR EACH and DO define the start of a new block.
A trigger is a block of its own.