RasGetEapUserIdentityA

Undocumented in source but is binding to Windows. You might be able to learn more by searching the web for its name.
@system extern (Windows)
static if(_WIN32_WINNT >= 0x500)
DWORD
RasGetEapUserIdentityA
(
LPCSTR
,
LPCSTR
,
DWORD
,
HWND
,)

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