EXTERN
Defines one or more external variables, labels, or symbols called name whose type is type.
Syntax
EXTERN ⟦language-type⟧ name ⟦ (altid) ⟧ : type ⟦, ⟦language-type⟧ name ⟦ (altid) ⟧ : type ...⟧
Remarks
The language-type argument is valid in 32-bit MASM only.
The type can be ABS, which imports name as a constant. Same as EXTRN.
The type can also be PROC, in which case name is treated as an external procedure.