{{page>en:templates:dosshell}}

====== INT 2FH, AH=4BH ======

^ AL ^ Description ^ Version ^
| [[en:docs:switcher:1]] | BUILD CALLOUT CHAIN | ? |
| [[en:docs:switcher:2]] | INSTALLATION CHECK | ? |
| [[en:docs:switcher:3]] | ALLOCATE SWITCHER ID | ? |
| [[en:docs:switcher:4]] | FREE SWITCHER ID | ? |
| [[en:docs:switcher:5]] | IDENTIFY INSTANCE DATA | ? |
| [[en:docs:switcher:80|80H]] |RESET INTERNAL VARIABLES | WSWAP.EXE |

**Note: This API implemented by DOSSWAP.EXE under DOS and by WINOLDAP.MOD under Windows **