_i_n_P_o_i_n_t_e_r Specifies the value to assign to GGGGLLLLCCCC____DDDDAAAATTTTAAAA____PPPPOOOOIIIINNNNTTTTEEEERRRR.
DDDDEEEESSSSCCCCRRRRIIIIPPPPTTTTIIIIOOOONNNN
ggggllllccccDDDDaaaattttaaaaPPPPooooiiiinnnntttteeeerrrr assigns the value _i_n_P_o_i_n_t_e_r to the variable
GGGGLLLLCCCC____DDDDAAAATTTTAAAA____PPPPOOOOIIIINNNNTTTTEEEERRRR. It is used for access to client data from a callback
function.
ggggllllccccDDDDaaaattttaaaaPPPPooooiiiinnnntttteeeerrrr provides a way to store in a GLC context a pointer to
arbitrary application data. A GLC callback function can subsequently use
the command ggggllllccccGGGGeeeettttPPPPooooiiiinnnntttteeeerrrr((((GGGGLLLLCCCC____DDDDAAAATTTTAAAA____PPPPOOOOIIIINNNNTTTTEEEERRRR)))) to obtain access to these
data in a thread-safe manner.
EEEERRRRRRRROOOORRRRSSSS
GGGGLLLLCCCC____SSSSTTTTAAAATTTTEEEE____EEEERRRRRRRROOOORRRR is generated if the issuing thread has no current GLC