#### E.13.3 The `F` Request Packet

The `F` request packet has the following format:

‘`Fcall-id,parameter…`’

  call-id is the identifier to indicate the host system call to be called. This is just the name of the function.

  parameter… are the parameters to the system call. Parameters are hexadecimal integer values, either the actual values in case of scalar datatypes, pointers to target buffer space in case of compound datatypes and unspecified memory areas, or pointer/length pairs in case of string parameters. These are appended to the call-id as a comma-delimited list. All values are transmitted in ASCII string representation, pointer/length pairs separated by a slash.