Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
Definition of Language Type
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  See also: .MODEL, OPTION LANGTYPE:, INVOKE, PROTO, PROC,
            OPTION PROLOGUE:, /G<x>, /H, MASM 5.1 Compatibility
 
                              C    SYSCALL STDCALL  BASIC  FORTRAN  PASCAL
                          ┌───────┬───────┬───────┬───────┬───────┬───────┐
  Leading Underscore      │   X   │       │   X   │       │       │       │
                          ├───────┼───────┼───────┼───────┼───────┼───────┤
  Capitalize All          │       │       │       │   X   │   X   │   X   │
                          ├───────┼───────┼───────┼───────┼───────┼───────┤
  Arguments Left to Right │       │       │       │   X   │   X   │   X   │
                          ├───────┼───────┼───────┼───────┼───────┼───────┤
  Arguments Right to Left │   X   │   X   │   X   │       │       │       │
                          ├───────┼───────┼───────┼───────┼───────┼───────┤
  Caller Stack Cleanup    │   X   │       │   *   │       │       │       │
                          ├───────┼───────┼───────┼───────┼───────┼───────┤
  BP Saved                │       │       │       │   X   │   X   │   X   │
                          ├───────┼───────┼───────┼───────┼───────┼───────┤
  :VARARG Allowed         │   X   │   X   │   X   │       │       │       │
                          └───────┴───────┴───────┴───────┴───────┴───────┘
 
  * The STDCALL language type uses caller stack cleanup if the :VARARG
    parameter is used. Otherwise, the called routine must clean up the
    stack.
 
  The language type (langtype) determines the naming and calling conventions
  used by the assembler. This allows you to share code and data with
  modules written with other languages. Set the language type with the
  .MODEL or OPTION LANGTYPE: directives or with the /G<x> command-line
  option. Several directives allow you to specify a langtype
  parameter to temporarily override the language type.
 
  You can use the /H command-line option to limit the length of names
  sent to the object file. Use this option to work with languages that
  limit the maximum length of identifiers.
                                    -♦-