A problem about system-call

hi guys,
 i found in the interface IF_HTTP_ENTITY
 the method SET_HEADER_FIELD has the codes like below
 system-call ict
 did
 ihttp_scid_add_header_field " add instead of set!!!
 parameters
 m_c_msg " > c handle
 name " > header field name
 value " > header field value
 m_last_error. " < return code
i have look at the help of the system-call ,but i cant find the same help about the ICT and did
my question is can somebody give some explanation about
system-call ict
did
parameter
thank you

hi
i just only new in BSP application,my question is why after the "system-call" we can use the parameter "did" and "ict".
i have just refer to the help document of the "system-call" but i can't find the information about the code
system-call ict
did
ihttp_scid_add_header_field " add instead of set!!!
parameters
m_c_msg " > c handle
name " > header field name
value " > header field value
m_last_error. " < return code

so can you give me some explanation about this ?
i wont do something to change them.
thank you

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