Refresh

Refresh[expr,opts]

represents an object whose value in a Dynamic should be refreshed at times specified by the options opts.

specifies that the value of expr should never automatically be refreshed.

Details and Options

The following options can be given:
TrackedSymbols Automatic symbols whose changes trigger an update

UpdateInterval Infinity time interval at which to do updates
When Refresh[expr,opts] is evaluated inside a Dynamic, it gives the current value of expr, then specifies criteria for when the Dynamic should be updated.
When one Refresh appears inside another, the innermost Refresh takes precedence.
Refresh[expr] resets automatic updating even if it appears inside Refresh[…,None].
The setting UpdateInterval->t specifies that updating should be done at least every t seconds.
Refresh has attribute HoldFirst.

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Make a dynamically updating clock:

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Introduced in 2007

(6.0)

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	TrackedSymbols	Automatic	symbols whose changes trigger an update
	UpdateInterval	Infinity	time interval at which to do updates