It is difficult to keep your attention focused for long periods of time. When using a complex system, end users may lose track of where they are, especially if they suffer interruptions. You should provide information to remind users where they are and what they are doing.
This should be standardized and in the same place (for example, titles and instruction areas on a panel) so that it can be ignored unless needed. The most useful information to establish a context for is generally information about any immediately related entities; for instance, the customer for whom an order is raised or the department to which an employee belongs. The presence of such information makes it possible for the user to establish what he is doing at a glance—especially when returning after an interruption. Connections between panels should follow the structure of the data so as to facilitate this.
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