A family of Microsoft relational database management systems designed for ease of use.
Hey Radek,
Visual aids is a quick aid tool to help you with Snap and Glue behavior for the shapes.
The settings that you select in this visual aids dialog will be persisted for the current document and once you close the document/drawing it will be reset to default settings for this dialog.
I hope that it answers your question.
Let me know if you need more information.