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4.4.1 Conditions under Language Level 3.50
The concept of conditions was very much expanded from REXX
language level 3.50 to level 4.00. Many of the central features in
conditions are new in level 4.00, these include:

    The CALL method is new, previously only the SIGNAL method was
  available, which made it rather difficult to resume execution
  after a problem. As a part of this, the DELAY state has been added

    The condition NOTREADY has been added, to allow better
  control over problems involving stream I/O.

    The built-in function CONDITION() has been added, to allow
  extraction of information about the current trapped condition.