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 too. · 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.