The monitor command COMPILE <file name>.<extension>
causes one of the following compilers to be used,
depending on the <extension>:
.(BLANK)	FAIL
.FAI		FAIL
.MAC		MACRO
.SAI		SAIL
.OSA		OLD SAIL (BACKUP)
.F4		FORTRAN

The COMPILE command runs the SNAIL program, which also processes
commands which allow loading and execution of programs as well as
compilation.  The complete documentation of SNAIL is in a file
found by the command READ SNAIL.