ipc/sem_os_key_top SAP Parameter attribute -

ipc/sem_os_key_top is a SAP Parameter attribute which is used to control information. This is available within R/3 SAP systems depending on the version and release level.

Below is the standard documentation available and a few details of the attributes values .

ipc/sem_os_key_top profile paramerter attributes

Parameter Name: ipc/sem_os_key_top
Description:
Default Value: 29999
Parameter Type ( See IF_PARAMETER_TYPES): Integer(INT)
Restriction Values:
Parameter Unit:
Parameter Group: IPC
CSN Component: BC-CST-LL
System-Wide parameter: No
Dynamic Parameter: No
Vector Parameter: No
Has Sub-Parameters: No
Check Function Exists: No

Parameter documentation

An SAP instance uses operating system semaphores from a defined range. This range starts with a number, such as 30000, 20000. A semaphore has the format X<(><<)>NN><(><<)>yyyy>, where NN is the instance number. This parameter defines the upper limit for the sempahore numbers. Examples: 29999, 39999..

See SAP Parameter Documentation for full SAP documentation for this profile parameter.