Possible returns from WinGetLastError

PMERR_NO_SPACE (0x1201)

The limit on the number of Window List entries has been reached with WinAddSwitchEntry.
PMERR_INVALID_WINDOW (0x1206)
The window specified with a Window List call is not a valid frame window.
PMERR_INVALID_SESSION_ID (0x120B)
The specified session identifier is invalid. Either zero (for the application's own session) or a valid identifier must be specified.

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