NtAlpcOpenSenderProcess
ALPC → NTSTATUS
NtAlpcOpenSenderProcess is a Windows NT kernel system call, in the ALPC category, returning NTSTATUS. Its syscall number is not the same on every Windows release: across the 50 version-and-architecture pairs recorded here it takes 19 distinct values, from 0x0021 to 0x01A2.
The number is an index into the system service table of one particular build, not a stable identifier, so it is not portable between Windows versions or between x64 and x86. The table below gives the value recorded for each.
Numbers across OS versions (50)
| OS Version | Architecture | Number |
|---|---|---|
| Windows 10 1507 | x64 | 0x0083 (131) |
| Windows 10 1507 | x86 | 0x0192 (402) |
| Windows 10 1511 | x86 | 0x0195 (405) |
| Windows 10 1511 | x64 | 0x0083 (131) |
| Windows 10 1607 | x86 | 0x0197 (407) |
| Windows 10 1607 | x64 | 0x0083 (131) |
| Windows 10 1703 | x64 | 0x0084 (132) |
| Windows 10 1703 | x86 | 0x019C (412) |
| Windows 10 1709 | x64 | 0x0084 (132) |
| Windows 10 1709 | x86 | 0x01A0 (416) |
| Windows 10 1803 | x86 | 0x01A0 (416) |
| Windows 10 1803 | x64 | 0x0085 (133) |
| Windows 10 1809 | x64 | 0x0085 (133) |
| Windows 10 1809 | x86 | 0x01A0 (416) |
| Windows 10 1903 | x64 | 0x0085 (133) |
| Windows 10 1903 | x86 | 0x01A0 (416) |
| Windows 10 1909 | x86 | 0x01A0 (416) |
| Windows 10 1909 | x64 | 0x0085 (133) |
| Windows 10 2004 | x64 | 0x0087 (135) |
| Windows 10 2004 | x86 | 0x01A1 (417) |
| Windows 10 20H2 | x64 | 0x0087 (135) |
| Windows 10 20H2 | x86 | 0x01A1 (417) |
| Windows 10 21H1 | x86 | 0x01A1 (417) |
| Windows 10 21H1 | x64 | 0x0087 (135) |
| Windows 10 21H2 | x86 | 0x01A2 (418) |
| Windows 10 21H2 | x64 | 0x0087 (135) |
| Windows 10 22H2 | x64 | 0x0087 (135) |
| Windows 10 22H2 | x86 | 0x01A2 (418) |
| Windows 11 and Server 11 21H2 | x64 | 0x0087 (135) |
| Windows 11 and Server 11 22H2 | x64 | 0x0087 (135) |
| Windows 11 and Server 11 23H2 | x64 | 0x0087 (135) |
| Windows 11 and Server 11 24H2 | x64 | 0x0089 (137) |
| Windows 11 and Server 11 25H2 | x64 | 0x0089 (137) |
| Windows 11 and Server Server 2022 | x64 | 0x0087 (135) |
| Windows 11 and Server Server 2025 | x64 | 0x0089 (137) |
| Windows 11 and Server Server 23H2 | x64 | 0x0088 (136) |
| Windows 7 SP0 | x86 | 0x0022 (34) |
| Windows 7 SP0 | x64 | 0x007D (125) |
| Windows 7 SP1 | x86 | 0x0022 (34) |
| Windows 7 SP1 | x64 | 0x007D (125) |
| Windows 8 8.0 | x86 | 0x0186 (390) |
| Windows 8 8.0 | x64 | 0x0082 (130) |
| Windows 8 8.1 | x86 | 0x018B (395) |
| Windows 8 8.1 | x64 | 0x0082 (130) |
| Windows Vista SP0 | x64 | 0x007D (125) |
| Windows Vista SP0 | x86 | 0x0021 (33) |
| Windows Vista SP1 | x86 | 0x0021 (33) |
| Windows Vista SP1 | x64 | 0x007D (125) |
| Windows Vista SP2 | x86 | 0x0021 (33) |
| Windows Vista SP2 | x64 | 0x007D (125) |