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# Concurrent Groups

A Concurrent Group is a section of a script in which all functions are executed concurrently. The web_concurrent_start function marks the beginning of a concurrent group. The end of the group is marked by the web_concurrent_end function. Within the Concurrent group, you may include Action functions and several Service functions.

Note that the functions included within the concurrent group are not executed immediately. Instead, they are registered for concurrent execution. When the concurrent group is closed, all of the functions registered as concurrent are executed together.

This function is supported for all web scripts.

Note: "Mode=HTML" is not allowed on web_url/web.url requests in concurrent groups.

See Concurrent Group Functions - C Language for a list of C functions that may be included within a concurrent group .

The following functions may be used within a concurrent group for Java:

- web_url

- web_submit_data

- web_custom_request

- web_reg_save_param

- web_add_header

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