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call <toolbox>   statement

[call] ToolboxProcName[( arg1, arg2... )]

This statement calls a Toolbox procedure. A Toolbox procedure (as opposed to a Toolbox function) performs an operation without returning a value. To execute a Toolbox function, use the fn statement instead.
ToolBoxProcName must be previously defined in a toolbox statement.
If the procedure requires parameters, include them in a list surrounded by parentheses. (If the procedure does not take any parameters, then the parentheses are optional.)

ButtonSetTitle( 1, @"Beep" )
call ButtonSetTitle( 1, @"Beep" )

See also
fn <toolbox>