Set a number of flags to TRUE in a bit flag string.
cFlags := GT_NewFlag(20) // Create a bit flag string for 20
// logical values.
// Now set flags 10 to 15 to true.
cFlags := GT_SetFlag(cFlags,10,15)
// And set flag 18 to true.
cFlags := GT_SetFlag(cFlags,18)
// And set flag 1 to true.
cFlags := GT_SetFlag(cFlags)