Hi,
ISQL is a command line program that runs from either a DOS or a Unix command line.
Its format is
ISQL -Uuser_name -Sserver_name -Ppassword
You can then use any standard SQL commands, remembering to enter "go" as a command to execute your statements, so to run a stored proc from the command line will be:
EXEC stored_procedure
GO
ISQL is very useful, as it sends commands directly to and from the database server, instead of through any middle applications, such as query analyzer, so processing times are quicker. It is, however, impossible to edit in ISQL, so writing programs there is still not recommended.
You could also try an internet search on ISQL for more information.
HTH
Tim