This command forces all currently open and non-frozen view and monitor windows to be re-evaluated, halting the process, if necessary, to get the information. If it halts the process, it will resume it after refreshing the windows. This provides a quick and easy way to update your view windows to their current values without having to manually halt the process and then resume it.
If interval is specified, then MULTI will automatically do an update approximately every interval seconds while the program is running. This is a useful way to monitor the value of a variable continuously while the program is running. To deactivate the automatic update, specify 0 for interval.