DBCHCL
DBCHCL obtains and initializes the CLI2SCB. If the application has specified that options values in the DBCAREA are to be used, the options are copied from the DBCAREA to the System Control Block (SCB); otherwise, options are copied from the System Parameter Block (SPB). A Request Control Block (RCB) is then allocated and initialized for the logon sequence. The application may provide token identifiers for its own use when starting a request or a session; the value of this DBCAREA field will be copied to the logon RCB and will be returned whenever the logon request is referenced.
DBCHCL obtains and initializes request and response buffers. DBCHCL prepares a Logon parcel and a Run (or Connect) parcel in the Request Buffer. The request is sent to MTDP.