.MH "Using Primos from the Subsystem"
.bq
.pp
Unfortunately, a few functions of Primos and its support
programs have not been neatly bundled into the Subsystem.
The Subsystem commands that address this
problem are the topic of this section.
.eq
.#
.#
.SH "Executing Primos Commands from the Subsystem"
.#
.#
The commands 'x' and 'primos' can be used to access Primos programs
and commands
without having to go through the work of leaving and re-entering the
Subsystem.
.pp
'X' may be used in either of two ways; the first is
.be
.bf
x  Primos-command
.ee
This is the method of choice for executing a single Primos command.
You will probably want to put double quotes around the Primos
command to keep the Subsystem from becoming annoyed at metacharacters
such as ">" and "<" being used in the Primos command.
.pp
The second way to use 'x' is to use it without arguments.  Here
is an example:
.be 7
] [bf x]
ok, [bf status net]
ok, [bf message -9 now]
[bf Hi there.]
ok, [bf <control-c>]
]
.ee
This method
allows many Primos commands to be executed. In this case,
'x' reads a line at a time and passes it to the Primos command interpreter
for execution.  If the Primos return code is positive,
'x' continues to the next line; if not, 'x' exits to the Subsystem.
'X' will also return to the Subsystem when it encounters a control-c
or a Primos REN.
The prompt, "ok,", is in small letters to remind you that
it is the command 'x' producing the prompt and not Primos.
.pp
The second command, 'primos', invokes a new level of the Primos command
interpreter from the Subsystem.  (With this command, the
Primos command interpreter prints the prompt "OK," and your commands
are received directly by it.)
You can return to the Subsystem
by typing the Primos REN command.