In Conversational Mode, SWITCH will not affect the current transaction in progress.
In Pseudo-Conversational Mode, SWITCH will take effect when the current transaction RETURNS control back to CICS and resumes.
If a transaction accesses a VTS-TSR using a linked table (using VTSFIRST, VTSLAST or the VTSname in a Library list (ML command with VTS:xxxx)) and a VTS SWITCH occurs, the SWITCH will not be recognized until the linked table is closed and reopened by tableBASE or the VTS-TSR is taken down, returning a 1072 error code.