IDA Help: Debugger: modules

// Enumerate process modules
// These function return the module base address

long get_first_module();
long get_next_module(long base);

// Get process module name
//      base - the base address of the module
// returns: required info

string get_module_name(long base);

// Get process module size
//      base - the base address of the module
// returns: required info or -1

long get_module_size(long base);