Control statements are command sequences which permit a conditioned program processing or recurring orders (If then-queries, loops, subroutines etc.).
With commands for macros and macroobjects external subroutines which can be used by several objects can be provided.
In addition, instructions belong to the use of the internal parameter memory ("buffer") moreover.
With operations to the writing and reading of external files the binding succeeds to other programs.
All control statements are essential for advanced GDL programming.