Unix FTP can be used to transfer files between PC's and Unix-based file servers File transfer protocol (FTP) is the network protocol that is used to transfer the files from the PC to the Unix file server over TCP

In the early days of computing, mainframe users accessed their systems using a dumb terminal Dumb terminals are input/output devices with no processing capability and only enough memory to decipher particular control codes

TN3270 emulation is a communications standard that allows a remote terminal such as a Windows workstation to communicate with an IBM or IBM-compatible mainframe Originally, 3270 display terminals, also known as "dumb terminals", were used to connect to mainframes

VT220 Emulation uses the telnet protocol to create a TCP/IP connection to a remote host typically running the Unix, AIX, IBM i or Linux operating system Originally, video terminals were used to communicate with these systems

TN5250 emulation uses the telnet protocol to create a TCP/IP connection to a remote host Initially, IBM 5250 terminals were sold with IBM's System/34 minicomputer system

FTPS is a protocol for transferring files using SSL to secure the commands and data that are being transferred between the client and the server Secure Sockets Layer (SSL) and its successor Transport Layer Security (TLS), are cryptographic protocols that provide secure communications on the Internet for such things as web browsing, e-mail, FTP and other data transfers

The IBM pSeries line of servers, also known as IBM System p, was originally named RS/6000 These servers run the AIX, IBM i or Linux operating systems

Legacy system integration can be defined as reusing existing legacy systems and applications by integrating them with newly developed enterprise applications Legacy system integration provides a non-intrusive method of reusing existing mission-critical applications that reside on legacy systems such as the mainframe or AS/400

In 1988, IBM introduced the AS400® as a server solution for midsize businesses and departments within larger enterprises Over time, IBM realized that in order to fulfill their vision of replacing PC and Unix servers throughout organizations worldwide, the AS400 would need to be easily integrated with distributed networks and web applications

SFTP is a protocol for transferring files using SSH to secure the commands and data that are being transferred between the client and the server When using FTP, the data that is being transferred is not encrypted, exposing this data to eavesdropping, tampering, or message forgery