1 06/04/82  program_interrupt, pi
 2 
 3 Syntax:  pi
 4 
 5 
 6 Function: informs a suspended invocation of a subsystem that the user
 7 wishes to abort the current request.
 8 
 9 
10 Notes: The program interrupt command is used with interactive
11 subsystems.  Interactive subsystems are commands that accept user
12 requests from the terminal.  To abort a subsystem request the user
13 uses the quit (or break) key to interrupt execution, and then gives
14 the program_interrupt command.  If the subsystem supports the use of
15 the program_interrupt command, it will abort the interrupted request
16 and ask the user for a new one.  If the subsystem does not support the
17 use of program_interrupt, the command will print an error message.
18 The user may then either restart the interrupted operation with the
19 "start" command, or abort the entire subsystem invocation with the
20 "release" command.
21 
22 
23 List of subsystems that support pi:
24    The following subsystems support the use of the
25    program_interrupt command--
26 debug               probe
27 edm                 qedx
28 emacs               read_mail
29 forum               send_mail
30 help                teco
31 lisp                ted
32 print_mail