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A166 User's Guide
A166 Introduction Assembling Programs Operands and Expressions Operators Control Statements 
Macro Processor Standard Macro Processor 
Standard Macro Controls Defining Standard Macros Calling Standard Macros Local Symbols Exiting A Macro Built-in Macros REPT IRP IRPC Standard Macro Operators NUL Operator & Operator < and > Operators % Operator ;; Operator ! Operator MPL Macro Processor MPL Macro Overview MPL Meta Character Defining MPL Macros Calling MPL Macros Local Symbols Expressions Common Functions Bracket Function Comment Function Escape Function METACHAR Function SET Function EVAL Function Comparison Functions Conditional Functions EXIT Function IF Function REPEAT Function WHILE Function Console I/O Functions String Functions LEN Function MATCH Function SUBSTR Function Advanced Literal Delimiters Blank Delimiters Identifier Delimiters Literal and Normal Modes Errors Error Messages AppendixIdentifier Delimiters
Identifier delimiters are legal macro identifiers designated as delimiters. To define a macro that uses an identifier delimiter, you must prefix the delimiter with the @ symbol. You must separate the identifier delimiter from the macro identifiers (formal parameters or macro names) by a blank character.
When calling a macro defined with identifier delimiters, a blank delimiter must precede the identifier delimiter, but none must follow the identifier delimiter.
This example shows identifier delimiters' use in source text:
%*DEFINE (ADD X1 @TO X2 @STORE X3)(
MOV R1,%X1
MOV R2,%X2
ADD R1,R2
MOV %X3,R1
)
%ADD VAR1 TO VAR2 STORE VAR3
This example shows identifier delimiters' use in output text:
MOV R1,VAR1 MOV R2,VAR2 ADD R1,R2 MOV VAR3,R1
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