Language Environment Interface Reference

Processing User Requests

How a language environment processes a user request depends on how the language environment receives the request. Net.Data provides several different ways for you to communicate a request to your language environment:

• Through the function name specified on a FUNCTION block. On every function call, Net.Data passes the function name to the language environment in the function_name field of the dtw_lei_t structure.
• Through the FUNCTION block parameter list. You can specify that a parameter in the parameter list can indicate a user request. On every function call, Net.Data passes parameters to the language environment in the parm_data_array field of the dtw_lei_t structure.
• Through the executable-statements section of a FUNCTION block. On every function call, Net.Data passes any executable statements specified in the FUNCTION block to the language environment in the exec_statement field of the dtw_lei_t structure.