Returns a pointer to the buffer for the active record.
Syntax:
function ActiveBuffer: PChar;
Description:
ActiveBuffer is used internally by many dataset methods to ensure that the active buffer
points to the buffer for the active record. If an application uses existing dataset methods, the active
buffer is always set correctly, so there is usually no need to call ActiveBuffer directly.
ActiveBuffer is also used by bookmarking methods to index into the active record buffer to
retrieve bookmark information.
Applications that provide custom dataset routines may need to call ActiveBuffer to access
the buffer data.