The files are located in directories determined using the following logicals in the system-wide table:
| A1MAIL$LIBRARY | SYS$SYSTEM | SYS$SHARE |
| SYS$HELP | SYS$TEST | SYS$LIBRARY |
| SYS$MESSAGE | SYS$STARTUP |
The version number is retrieved from the following executable files in SYS$SHARE:
| A1MAIL$SHARE.EXE | MUAS$CLIENT_ SHARE.EXE |
| A1MAIL$MESSAGES.EXE | X400$SSI_SHARE.EXE |
The A1MAIL$LIBRARY and the Mail User Agent Server are used to get standard device information.