Introduction to Z3LIB
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Z3LIB contains support utilities which provide access to ZCPR3-
specific features and capabilities.  Z3LIB routines can be
divided into four categories:

1. ZCPR3 Environment Access -- Utilities enabling you to
easily extract data from the Z3 Environment Descriptor and
modify certain Z3 environment parameters

2. ZCPR3 Flow Control -- Utilities allowing you to easily
manipulate ZCPR3's Flow Control environment by raising/lowering
the current IF level and toggling the current IF condition

3. ZCPR3 Messages -- Utilities providing access to ZCPR3
messages, enabling programs to read and write messages from and
to the system

4. ZCPR3 Utilities -- Utilities which relieve you from
constantly reprogramming some commonly-used ZCPR3 features