The compiler looks-ahead a token most of the time, so you might throw an extra 
semicolon after the directive if it's not taking affect right away.

#include_text   is slightly faster than #include if you have no graphics.
#prefetch       will load-in files while compiling others.
#exe {}         Will execute code at compile type and can be used to insert code 
into the stream being compiled using StreamPrintF().
#define         Define string constant
#assert         Print a warning during compilation if an expression is not true.
#if             Include code if an expresion is true.
#else
#endif
#ifdef,#ifndef  Include code if a sym is defined.
#ifstatic,#ifnstatic    Include code if in static compiler mode.
defined()       Is a function that can be used in expressions.
#help_index, #help_file See Help System.

See Scoping and Linkages, preprocessor and Compiler Options.


Assembler Directives

See ::/LT/Compiler/OpCodes.TXZ for opcodes.  They're not standard.  Some invalid 
instructions are not flagged and some valid instructions are not implemented. 
16-bit asm support is limited.

Here are example instruction formats:
        ADD     RAX,U64 FS:DISP[RSI+RDI*8]
        ADD     RAX,U64 [DISP]

$ Current compiler output pos (instruction ptr).  Even works in C+ expressions.

LABEL::
  Defines an exported glbl label.

LABEL:
  Defines an non-exported glbl label.

@@LABEL:
  Defines a local label with scope valid between two global labels.

DU8, DU16, DU32, DU64
  Define BYTE, WORD, DWORD or QWORD. Can be used with DUP() and ASCII strings.  
For your convenience, the ASCII strings do not have terminating zeros.  DUP() 
can be used with ? for uninitialized values.  Use uninitialized values in 
struc's.  Define cmds must end with a semicolon.

STRUC  new_ip
ENDS

USE16, USE32, USE64

IMPORT sym1name, sym2name;

LIST, NOLIST

ALIGN num, fill_byte
  Align to num boundary and fill with fill_byte.
ALIGN num, ?
  Align to num boundary but do not fill.

See ::/LT/Demo/Asm/AsmAndC.CPZ and ::/LT/Demo/Asm/AsmAndC2.CPZ.