The ALIAS directive creates an alternate name for a function. This lets you create multiple names for a function, or create libraries that allow the linker (LINK.exe) to map an old function to a new function.

ALIAS <alias> = <actual-name>

actual-name
The actual name of the function or procedure. The angle brackets are required.

alias
The alternate or alias name. The angle brackets are required.

Directives Reference
MASM BNF Grammar