Execution-Time Control

The user can control standard SNOMAN code at execution time with two sets of commands:-

• The FILE command. This controls the external inputs and outputs by associating file names and options with SU streams.

• The TITLES and SET BANK commands. Together these give access to, and modify the contents of, titles banks. These act as ``control panels'' that connect to the internal workings of the code.

User code can also use these mechanisms so that it can have the same look and feel. This is clearly important if the code will eventually migate into SNOMAN. In the case of the FILE command, only the USR stream is available, but may be used even if the user code does not go into the USR processor (so long as the user does not also switch on USR!) The standard USR as supplied provides a simple demonstration of both the FILE command and a titles bank. For a detailed discussion of titles banks and the FILE command, see the Programmer's Manual.