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AX = 4B03h ES:DI -> task switcher entry point (see #02819)
Return:
AX = 0000h BX = switcher ID (0001h-000Fh), or 0000h if no more available
Notes: If a task switcher has determined that it is the first to be loaded, it must allocate an identifier for itself and provide this function to all subsequent task switchers; if it is not the first to be loaded, it must call this function to allocate an ID. The switcher ID is used as the high four bits of all session identifiers to ensure unique session IDs.. If no more switcher IDs are available, the new task switcher making the call must terminate or disable itself. The task switcher providing the identifiers may call the new task switcher's entry point as needed. This call is available from within DOSSHELL even if the task switcher is not installed. This function is supported by PC Tools v8+ CPTASK, but appears to always return an ID of 0000h
Category: DOS-Based Task Switchers/Multitaskers - Int 2Fh - D
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