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.