This is only available using the msgAPI (FVAPISession) mode.
This function works the same way as fvApi.SendKeys except that it is defined as an async function and will return a Promise, enabling the use of an await on the execution.
If you have a series of fvApi.SendKeys calls that you want to ensure run synchronously in the msgAPI environment, use this instead.
For example:
await fvApi.SendKeysEx('[enter]');
await fvApi.SendKeysEx('[clear]');
await fvApi.SendKeysEx('info[enter]');