VerifyFocus checks that the expected control that has the input focus in a window. Only controls can have input focus, not top-level windows (such as dialog boxes).
If a timeout is specified with the nTimeout parameter, Silk Test Classic calls VerifyFocus() until the condition is verified or the timeout is reached. The time between checks is the value of the window retry interval Agent option (OPT_WINDOW_RETRY). If the verification fails, an exception is thrown.