In at least one hardware definition language file, at least one design entity containing a functional portion of a digital system is specified. Also provided are polyglyceryl compounds which may compose such compositions, and uses of the polyglyceryl compositions and compounds. According to a preferred embodiment of the invention, the emergency call is disconnected after said step of transmitting; and prior to said step of transmitting, optionally first over private network and to the public network PSAP, a timer is initiated. The stress on the flexible connector is limited by the contact of two edges which are positioned to prevent the flexible connector from undergoing stress beyond a specified level.