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Macros may only be entered as the first thing in a command, because macros
are stored 'commands', not stored text (like PL variables).
SqlTool functions are macros that accept positional parameters and the function
names always end with () (like "myFunction()").
Unless noted, everything said here about macros also applies to functions.

/?                     Display this help
/=                     Display all macros
/= name body...        Define a macro with body of the specified Special, PL,
                       or SQL command (do not type the SQL-terminating ";").
/: name [appendage]    Define a macro wth body equal to the current buffer
                       contents.  If you want your 'appendage' to begin with a
                       space, then you must type two spaces after the name
                       here.  This can be used to define a macro with content
                       of a multi-lined SQL statement, or even of chunked SQL
                       statements.
/name [appendage]      Expand (non-function) macro to buffer
/name [appendage];     Execute (non-function) macro after variables in body
                       are dereferenced
/name(param1,...) [appendage]    Expand function to buffer
/name(param1,...) [appendage];   Execute function after dereferencing

Macros may contain PL variable references.
The references are not expanded until the macro executes.  Use the : syntax,
like *{:name} to prevent the execution from failing if that variable is not set
(this will cause the unset variable to expand to the empty string).

Define functions exactly as you define macros, except with names like "this()",
and the function body may contain positional PL variable references like
*{1}, *{2}, *{:3}, etc.  Use the colon (like "*{:3}") for optional parameters
(see previous paragraph).
Use functions exactly like macros, except insert comma-separated parameters (if
any), between the parentheses of the function name, like
"fn1();" or "fn2(first param value, second param value)".