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Used by MFServer to distinguish between incoming calls of different importance levels. For example, less important calls may be rejected if the server is busy.

CALL_IMPORTANCE_DEFAULTCall importance not set. Usually defaults to eciNormal.0
CALL_IMPORTANCE_NORMALNormal call. Calls of this type are never rejected. Multiple concurrent calls are served by concurrent threads in MFServer. Most calls should specify this importance level.1
CALL_IMPORTANCE_CAN_BE_REJECTEDA less important call, e.g. cache prefilling. This type of calls can be rejected by the server if it is currently too busy (e.g. servicing too many other calls). If MFServer rejects a call, E_MFILES_CALL_REJECTED is returned.2