GI.UPD - Update UICs and Default Directory
 
 NOTE: You must include a variable for every element in the macro definition. 
              
 Macro Call:
 
     GIN$     GI.UPD, buf, siz 
 
       GI.UPD   GIN$ function code (17.)
 
       buf      Address of 5 or 32 word buffer to receive the information
 
       siz      Buffer size in words
 
 Buffer Format:
 
     Word  0    System UIC
     Word  1    Library UIC
     Word  2    H.DUIC for the requesting task
     Word  3    H.CUIC for the requesting task
     Word  4    Login UIC
     Word  5    (Optional) Current terminal UIC
     Word  6    (Optional) Radix-50 CLI name, first half
     Word  7    (Optional) Radix-50 CLI name, second half
     Word  8    (Optional) ASCII system name, first third
     Word  9    (Optional) ASCII system name, middle third
     Word 10    (Optional) ASCII system name, final third
     Word 11    (Optional) Network UIC
     Word 12    (Optional) System size in 32-word blocks
 
 DSW Return Codes:
  
      IS.SUC   Successful completion.