are user-created files or scripts containing
sequences of SPIDER operations and parameter values. Procedure files
can have any alphanumeric name up to 77 characters but the
name must begin with a letter. Instead of taking
the input from the terminal, SPIDER uses the control sequence
as it appears in the procedure file. All output that would
normally appear on the terminal is directed to the RESULTS
file, and no <i>LOG</i> file is created.
Procedures may be called:
If a procedure is called from interactive session, when a
'RE' operation is encountered inside a procedure, control
will return to the terminal. If a procedure is called from
another procedure file, control will be passed to the
operation following the procedure call.
Some standard procedures are contained in the SPIDER system's procedure directory with the extension 'spi'.]