ACTCTX_REQUESTED_RUN_LEVEL - NtDoc

Native API online documentation, based on the System Informer (formerly Process Hacker) phnt headers
#ifndef _NTSXS_H
#if (PHNT_MODE == PHNT_MODE_KERNEL)

typedef enum _ACTCTX_REQUESTED_RUN_LEVEL
{
    ACTCTX_RUN_LEVEL_UNSPECIFIED = 0,
    ACTCTX_RUN_LEVEL_AS_INVOKER,
    ACTCTX_RUN_LEVEL_HIGHEST_AVAILABLE,
    ACTCTX_RUN_LEVEL_REQUIRE_ADMIN,
    ACTCTX_RUN_LEVEL_NUMBERS
} ACTCTX_REQUESTED_RUN_LEVEL;

#endif
#endif

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This enumeration is documented in Windows SDK.