Answer / srinivas

web_reg_save_param()<Correlation with its various arguments>

lr_start_transaction()<labelling transactions>

web_custom_submit()<in case of testing any xml requests,
that you amy want to create and test>

atoi()<alpha to integer conversion for making a 0~9 type of
strings effective for use just after correlation because
correlation captures every thing as a string.

sprintf()< to create a charqacter array out of a string,
useful when attaching or augmenting a character array with
some random data returned from server. Generally found
significant immediately after correlations>

lr_whoami()<to generate a unique identifing number for any
vuser in a scenario in Controller>

There would be many more. These are generally used
irrespective of protocol you are using

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