Managing communication with the PemHeart Web Client software. PEM-HEART for WebClient is a programming component for Windows / Mac OS / Linux systems that provides signing and encryption functions for electronic documents from the level of a web browser. The software consists of the following components. • Native application • Browser extensions The native application is responsible for handling cards and performing operations of signing / encrypting documents. The browser extension provides a simple interface to the web application. The native application is launched automatically by the web browser when the browser calls one of the interface functions. The component can work with cryptographic cards available via the PKCS # 11 interface or use keys in PFX format (PKCS # 12) from a file on the disk.