Fastening and/or locking system

A releasable fastening system, for releasable fastening between a supporting device and a supported device, comprising:

• at least one receiving element attached to said supported device and at least one fastening element attached to said supporting device;
• said receiving element, further comprising:
• a base plate having a back surface and front surface supporting a cover plate thereon;
• a spring-loaded slide member slidably retained between said base plate and said cover plate;
• at least a first and a second elevated portion on said cover plate projecting away from said front surface of said base plate and defining a throughgoing channel therebetween;
• said first and said second elevated portions extending from a proximate side to a distal side of said base plate;
• a receiving region bounded under said first elevated portion above said front surface of said base plate shaped to slidably receive said spring-loaded slide member;
• an undercut on said second elevated portion proximate said throughgoing channel and partially projecting over said throughgoing channel;
• said undercut of said second elevated portion shaped to engage a protrusion extending from said fastening element;
• a recess on said undercut on said second elevated portion proximate said throughgoing channel shaped to receive said protrusion extending from said fastening element;
• and
• said spring-loaded urging said protrusion of said fastening element into said undercut and said recess during a use therewith.