Under UNIX, also a system editor can be called. Default is the UNIX editor 'vi'. The SET parameters of the end user tool from which the editor was called can be used to call any other editor installed on the system and supporting the same call syntax as the 'vi'.
Entering the command 'sysedit' in the command line of the built-in editor switches to the selected system editor, passing the contents of the edit form to it. Modifications to the contents must be saved within the system editor, if they are to be kept when returning to the end user tool.
To transfer the editor contents, a file is generated which will be deleted after having returned to the built-in editor.
The name ed.'pid' is used for this file. 'pid' denotes the string obtained from the process ID.