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# General Vuser functions

Each of the general Vuser functions has an lr prefix. The functions can be used in any type of Vuser script. The functions enable you to:

- Get runtime information about a Vuser, its Vuser group, and its host.

- Add transactions and synchronization points to a Vuser script. For example, the lr_start_transaction (lr.start_transaction in Java) function marks the beginning of a transaction, and the lr_end_transaction (lr.end_transaction in Java) function marks the end of a transaction. See Enhance scripts for more information.

- Send messages to the output, indicating an error or a warning.

## See also

- Function Reference

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