Activation Context Creation flow

The following describes how activation context is created currently in Windows XP/Windows Server 2003/Windows Vista.

1. CreateProcess/CreateActCtx is called.

2. CreateProcess/CreateActCtx does some validation, constructs a message, sends the message to CSRSS.exe, and waits for CSRSS.exe to return.

3. CSRSS.exe receives the message, and creates the activation context as described in

4. Once the activation context is created, CSRSS returns it to the client.

5. CreateProcess/CreateActCtx proceeds.

The getaway from the flow above is: most work is done in CSRSS.exe.