2. Structuring an Application : How You Can Change Global Constants at Runtime : Choosing a Concurrency Style : Inactive Frames
 
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Inactive Frames
An inactive frame is one in which the end user cannot execute an operation. A frame can become inactive in one of two ways:
The frame executes a callframe statement
The frame is temporarily blocked (even though it was opened with an openframe statement) because another frame is busy
If one frame is executing an event block that takes a long time, for example, all other frames are blocked.
In both cases an hourglass appears when the user moves the cursor over the inactive frame.