You can use the MODIFY LOAD command to explicitly load a load module from the host into the 3720 or 3745 Communication Controller external disk storage while an NCP is already active in the communication controller.

At activation time, you can use the LOADMOD operand of the VARY ACT command to specify the load module to be loaded into the communication controller. After activation, using the MODIFY LOAD command, you can use to add, replace, or purge load modules on the 3720 or 3745 Communication Controller disk.

You can add a load module to the communication controller external storage by using the ADD operand of the MODIFY LOAD command. If the load module to be added exists on the communication controller disk or if the maximum number of load modules allowed is already on the disk, the command fails.

You can replace a load module already on the communication controller disk by using the REPLACE operand of the MODIFY LOAD command. VTAM® then replaces the load module specified on the communication controller disk. If the load module is not present on the disk, an ADD operation is attempted.

The REPLACE operand affects the automatic activation of a load module if an automatic re-IPL is required. If the load module being replaced is the load module tagged for automatic re-IPL, then after the REPLACE operation starts, the load module is no longer tagged to be automatically activated when an automatic re-IPL is initiated. If an automatic re-IPL occurs while a REPLACE operation is running, the communication controller is not activated with any load module.

The CANCEL option of the MODIFY LOAD command can be used to stop an ADD or REPLACE operation that is in progress. If the CANCEL operand is used, the partially stored load module is purged from the disk.