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P4 Virtual File Service Documentation | 2026.1

# Prerequisites

- An installation of the P4 VFS client-side agent. To learn more, see Install and upgrade.

- Windows 10.1709 or later, or Windows 11.

- Client application, such as P4V 2023.2 (or later) or P4 2023.1 (or later).

- P4 Server 2023.1 (or later) with the `P4ALTSYNC` environment variable set.
  To verify the value of `P4ALTSYNC`, use the `p4 set` command.

  - Installing P4 VFS automatically sets this environment variable to the default agent:
    `P4ALTSYNC=pipe:\\\\.\\pipe\\local\\P4VirtualFileService`

- A 2024.2 (or later) P4 Server and a 2024.2 (or later) P4 client is required if you want to Specify hotfiles that don't create placeholders.

- A client application workspace with the `altsync` property enabled.

  - If you are using P4 Visual Client (P4V), see Enable P4V .

  - If you are using the P4 command line, see Enable P4.

- If you want to use a custom agent instead of the P4 VFS client-side agent, see Prerequisites for your custom agent under Optional: Custom development.

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