An entry point identifier is a character string of up to 70 characters that can be specified in a SAVE macro. The character string is created as part of the SAVE macro expansion.
A calling sequence identifier is a 16-bit binary number that can be specified in a CALL, LINK, or LINKX macro. When coded in a CALL, LINK, or LINKX macro, the calling sequence identifier is located in the two low-order bytes of the fullword at the return address. The high-order two bytes of the fullword form a NOP instruction.