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

If client is not given in the requirement? In that case how you are going to perform performance testing?

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