Cell references are an important part of creating formulas in Excel. Using cell references allows your formulas to update automatically if the value in a particular cell changes and can also assist you in updating formulas as cells are copied or moved. There are two basic types of cell references, each serving a different purpose. 1  Relative Cell References. 2  Absolute Cell References.
Diagram of a public key infrastructure. A public key infrastructure (PKI) is a set of hardware, software, people, policies, and procedures needed to create, manage, distribute, use, store, and revoke digital certificates and manage public-key encryption.he purpose of a PKI is to facilitate the secure electronic transfer of information for a range of network activities such as e-commerce, internet banking and confidential email.
.pk. .pk is the designated Internet country code top-level domain (ccTLD) for Pakistan. PKNIC is the only organization endorsed by the Government of Pakistan to undertake the administration of 'pk' domain names. PKNIC is a non-profit making, non-statutory, member-based corporation established in June 1992.