Parameters are used to pass information and data back and forth between client and server.

On the client side, you set parameters to be sent to the server using the JWaveExecute.setParam method. These parameters are not actually sent to the server until the execute method is called. After an execute, the client may retrieve parameters returned by the wrapper function using JWaveExecute.ReturnData (to get one parameter at a time) or getReturnParams (to get all the parameters at once).

On the server side, parameters passed from the client can be retrieved in a JWAVE wrapper with the GETPARAM function (a JWAVE-specific PV‑WAVE function). When a wrapper function returns, its return values are automatically sent to the client.

Passing Parameters and Data shows the most basic parameter passing scenario.

This section discusses the basic methods for passing parameters between JWAVE client and server applications.