Console name modification
Description: When SDSF needs to activate an extended console and the default console name is in use (for example, when you invoke SDSF from a REXX exec while also using SDSF interactively) SDSF attempts to activate a new console with a different name, which is derived by modifying the default console name. To modify the name, SDSF appends a single-character suffix. You can control console name modification with a command, ISFPARMS, REXX special variable or Java™ program.
When change was introduced: z/OS® V2R1
Reference information: z/OS SDSF Operation and Customization and online help